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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2012	Jul. 27, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	MKS INSTRUMENTS INC
Entity Central Index Key	0001049502
Document Type	10-Q
Document Period End Date	Jun. 30, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		52,874,664

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 409,216	$ 312,916
Short-term investments	196,350	252,603
Trade accounts receivable, net	104,827	120,894
Inventories	145,609	153,632
Deferred income taxes	10,516	10,618
Other current assets	25,078	34,238
Total current assets	891,596	884,901
Property, plant and equipment, net	73,983	72,487
Long-term investments	17,568	7,873
Goodwill	140,084	140,084
Intangible assets, net	1,031	1,043
Other assets	10,658	12,266
Total assets	1,134,920	1,118,654
Current liabilities:
Short-term borrowings		1,932
Accounts payable	23,430	24,853
Accrued compensation	21,973	21,774
Income taxes payable	4,602	7,548
Other current liabilities	34,567	40,324
Total current liabilities	84,572	96,431
Other liabilities	35,939	32,211
Commitments and contingencies (Note 14)
Stockholders' equity:
Preferred Stock, $0.01 par value per share, 2,000,000 shares authorized; none issued and outstanding
Common Stock, no par value, 200,000,000 shares authorized; 52,870,425 and 52,491,948 shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively	113	113
Additional paid-in capital	712,921	707,419
Retained earnings	291,765	268,870
Accumulated other comprehensive income	9,610	13,610
Total stockholders' equity	1,014,409	990,012
Total liabilities and stockholders' equity	$ 1,134,920	$ 1,118,654

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock, shares authorized	2,000,000	2,000,000
Preferred Stock, shares issued
Preferred Stock, shares outstanding
Common Stock, par value
Common Stock, shares authorized	200,000,000	200,000,000
Common Stock, shares issued	52,870,425	52,491,948
Common Stock, shares outstanding	52,870,425	52,491,948

Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2012

Jun. 30, 2011

Jun. 30, 2012

Jun. 30, 2011

Net revenues:

Products

$ 148,851

$ 198,737

$ 313,339

$ 406,184

Services

28,546

25,750

54,926

50,154

Total net revenues

177,397

224,487

368,265

456,338

Cost of revenues:

Cost of products

84,622

105,086

175,646

216,301

Cost of services

16,259

14,413

32,312

28,688

Total cost of revenues

100,881

119,499

207,958

244,989

Gross profit

76,516

104,988

160,307

211,349

Research and development

15,591

15,582

31,775

32,478

Selling, general and administrative

32,959

31,851

67,078

64,558

Amortization of intangible assets

119

250

238

500

Income from operations

27,847

57,305

61,216

113,813

Interest income

200

309

461

585

Interest expense

Income before income taxes

27,996

57,614

61,617

114,393

Provision for income taxes

9,424

19,013

20,277

37,749

Net income

18,572

38,601

41,340

76,644

Other comprehensive income:

Changes in value of financial instruments designated as cash flow hedges, net of tax (benefit) expense

^[1]

(522)

(517)

114

(123)

Foreign currency translation adjustments, net of tax of $0 for the three and six months ended June 30, 2012 and 2011

(4,353)

2,207

(4,052)

5,328

Unrealized (loss) gain on investments, net of tax (benefit) expense

^[2]

(25)

(8)

(61)

Total comprehensive income

$ 13,672

$ 40,283

$ 37,341

$ 81,888

Net income per share:

Basic

$ 0.35

$ 0.74

$ 0.79

$ 1.48

Diluted

0.35

0.73

0.78

1.46

Cash dividends per common share

$ 0.15

$ 0.30

Weighted average common shares outstanding:

Basic

52,679

52,346

52,591

51,877

Diluted

53,206

52,906

53,214

52,646

[1]	Tax (benefit) was $(330) and $(307) for the three months ended June 30, 2012 and 2011, respectively. Tax expense (benefit) was $89 and $(75) for the six months ended June 30, 2012 and 2011, respectively.
[2]	Tax (benefit) was $(16) and $(5) for the three months ended June 30, 2012 and 2011, respectively. Tax (benefit) expense was $(48) and $24 for the six months ended June 30, 2012 and 2011, respectively.

Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Statements of Operations and Comprehensive Income [Abstract]
Tax (benefit) expense on changes in value of financial instruments designated as cash flow hedges	$ (330)	$ (307)	$ 89	$ (75)
Tax on foreign currency translation adjustments	0	0	0	0
Tax (benefit) expense on unrealized (loss) gain on investments	$ (16)	$ (5)	$ (48)	$ 24

- Definition

Amount after tax, before reclassification adjustments, resulting from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency, and from transactions whose terms are denominated in a currency other than the entity's functional currency.

+ References

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+ Details

- Definition

Net of tax amount of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities.

+ References

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+ Details

- Definition

Net of tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

+ References

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6522872

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+ Details

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 41,340	$ 76,644
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,557	6,374
Stock-based compensation	7,079	6,048
Provision for excess and obsolete inventory	8,377	6,458
Deferred income taxes	2,179	2,485
Excess tax benefits from stock-based compensation	(1,995)	(5,218)
Other	486	299
Changes in operating assets and liabilities:
Trade accounts receivable	14,584	(10,953)
Inventories	(1,044)	(12,880)
Income taxes	2,955	(365)
Other current assets	4,022	(9,885)
Accrued compensation and other liabilities	(1,180)	2,614
Accounts payable	(1,365)	(2,897)
Net cash provided by operating activities	81,995	58,724
Cash flows from investing activities:
Purchases of investments	(199,576)	(197,574)
Maturities and sales of investments	246,024	192,944
Purchases of property, plant and equipment	(8,012)	(6,265)
Other	(26)	(166)
Net cash provided by (used in) investing activities	38,410	(11,061)
Cash flows from financing activities:
Proceeds from short-term borrowings	2,896	13,404
Payments on short-term borrowings	(4,771)	(12,791)
Repurchase of common stock	(4,960)
Net (payments) proceeds related to employee stock-based compensation	(1,088)	24,662
Dividend payments to common stockholders	(15,806)	(15,628)
Excess tax benefit from stock-based compensation	1,995	5,218
Net cash (used in) provided by financing activities	(21,734)	14,865
Effect of exchange rate changes on cash and cash equivalents	(2,371)	1,534
Increase in cash and cash equivalents	96,300	64,062
Cash and cash equivalents at beginning of period	312,916	162,476
Cash and cash equivalents at end of period	$ 409,216	$ 226,538

Basis of Presentation

6 Months Ended

Jun. 30, 2012

Basis of Presentation [Abstract]

Basis of Presentation

1)	Basis of Presentation

The terms “MKS” and the “Company” refer to MKS Instruments, Inc. and its subsidiaries. The interim financial data as of June 30, 2012 and for the three and six months ended June 30, 2012 and 2011 are unaudited; however, in the opinion of MKS, the interim data includes all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of the results for the interim periods. The consolidated balance sheet presented as of December 31, 2011 has been derived from the audited consolidated financial statements as of that date. The unaudited consolidated financial statements presented herein have been prepared in accordance with the instructions to Form 10-Q and do not include all of the information and note disclosures required by United States generally accepted accounting principles (“U.S. GAAP”). The consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the MKS Annual Report on Form 10-K for the year ended December 31, 2011 filed with the Securities and Exchange Commission on February 24, 2012.

The preparation of these consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On an on-going basis, management evaluates its estimates and judgments, including those related to revenue recognition, stock-based compensation, inventory, intangible assets, goodwill and other long-lived assets, acquisition expenses, income taxes and investments. Management bases its estimates and judgments on historical experience and on various other factors that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

Recently Issued Accounting Pronouncements

6 Months Ended

Jun. 30, 2012

Recently Issued Accounting Pronouncements [Abstract]

Recently Issued Accounting Pronouncements

2)	Recently Issued Accounting Pronouncements

In September 2011, the Financial Accounting Standards Board (“FASB”) issued an Accounting Standards Update (“ASU”) which simplifies how companies test goodwill for impairment. Under these amendments, an entity has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. However, if an entity concludes otherwise, then it is required to perform the first step of the two-step impairment test by calculating the fair value of the reporting unit and comparing the fair value with the carrying amount of the reporting unit, as described in the goodwill accounting standard. The amendments are effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. Early adoption was permitted. The Company adopted this new ASU in the fourth quarter of 2011. This new ASU did not have a material effect on the Company’s consolidated financial statements.

In June 2011, the FASB issued an ASU which eliminates the option to present the components of other comprehensive income as part of the statement of equity and requires an entity to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. The amendments were effective retrospectively for fiscal years, and interim periods within those years, beginning after December 15, 2011. The ASU requires changes in presentation only. The Company adopted this new ASU in the first quarter of 2012, electing to present the components of other comprehensive income as one continuous statement. This new ASU did not have a material effect on the Company’s consolidated financial statements.

In May 2011, the FASB issued an ASU which applies to all reporting entities that are required or permitted to measure or disclose the fair value of an asset, a liability, or an instrument classified in a reporting entity’s shareholders’ equity in the financial statements. The amendments do not extend the use of fair value accounting, but provide guidance on how it should be applied where its use is already required or permitted by other standards within U.S. GAAP. The amendments change the wording used to describe many requirements in U.S. GAAP for measuring fair value and for disclosing information about fair value measurements. Additionally, the ASU clarifies the FASB’s intent about the application of existing fair value measurements. The amendments in this ASU are to be applied prospectively. For public entities, the amendments were effective during interim and annual periods beginning after December 15, 2011. The Company adopted the new ASU in the first quarter of 2012. This new ASU did not have a material effect on the Company’s consolidated financial statements.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6510796

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-URI http://asc.fasb.org/extlink&oid=6507316

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-Paragraph b
-Subparagraph 6
-Article 10

+ Details

Investments

6 Months Ended

Jun. 30, 2012

Investments [Abstract]

Investments

3)	Investments

The fair value of short-term investments with maturities or estimated lives of less than one year consists of the following:


	June 30, 2012		December 31, 2011
Available-for-sale investments:
Time deposits	$	36	$	37
Bankers’ acceptance drafts		5,499		962
U.S. treasury obligations		—		29,404
U.S. agency obligations		190,053		221,565

		195,588		251,968

Trading investments:
Mutual funds		762		635

	$	196,350	$	252,603

The fair value of long-term available-for-sale investments with maturities of more than one year consists of the following:


	June 30, 2012		December 31, 2011
U.S. treasury obligations	$	8,035	$	—
U.S. agency obligations		9,533		7,873

	$	17,568	$	7,873

The following tables show the gross unrealized gains and (losses) aggregated by investment category for short-term and long-term available-for-sale investments:


As of June 30, 2012:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Time deposits	$	36	$	—	$	—		$	36
Bankers’ acceptance drafts		5,499		—		—			5,499
U.S. agency obligations		190,082		17		(46	)		190,053

	$	195,617	$	17	$	(46	)	$	195,588

Long-term investments:
U.S. treasury obligations		8,033		2		—			8,035
U.S. agency obligations		9,532		1		—			9,533

	$	17,565	$	3	$	—		$	17,568


As of December 31, 2011:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Time deposits	$	37	$	—	$	—		$	37
Bankers’ acceptance drafts		962		—		—			962
U.S. treasury obligations		29,393		11		—			29,404
U.S. agency obligations		221,516		56		(7	)		221,565

	$	251,908	$	67	$	(7	)	$	251,968

Long-term investments:
U.S. agency obligations	$	7,876	$	—	$	(3	)	$	7,873

Interest income is accrued as earned. Dividend income is recognized as income on the date the stock trades “ex-dividend.” The cost of marketable securities sold is determined by the specific identification method. Realized gains or losses are reflected in income and were not material for the three and six months ended June 30, 2012 and 2011, respectively.

The unrealized gains and losses for trading investments were immaterial for the three and six months ended June 30, 2012. The Company did not have trading securities as of June 30, 2011.

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-Glossary Debt Security
-URI http://asc.fasb.org/extlink&oid=6509901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-Glossary Equity Security
-URI http://asc.fasb.org/extlink&oid=6511694

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 3, 19, 20, 21, 22, 137
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Fair Value Measurements

6 Months Ended

Jun. 30, 2012

Fair Value Measurements [Abstract]

Fair Value Measurements

4)	Fair Value Measurements

In accordance with the provisions of fair value accounting, a fair value measurement assumes that the transaction to sell an asset or transfer a liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability and defines fair value based upon an exit price model.

The fair value measurement guidance establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The guidance describes three levels of inputs that may be used to measure fair value:


Level 1		Quoted prices in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis.

Level 2		Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments or securities or derivative contracts that are valued using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data.

Level 3		Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.

In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, we categorize such assets and liabilities based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset.

Assets and liabilities of the Company are measured at fair value on a recurring basis as of June 30, 2012, are summarized as follows:


			Fair Value Measurements at Reporting Date Using
Description	June 30, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market funds	$	207,700	$	207,700	$	—	$	—
Bankers’ acceptance drafts		184		—		184		—
Trading securities:
Mutual funds		762		762		—		—
Available-for-sale securities:
Bankers’ acceptance drafts		5,499		—		5,499		—
U.S. treasury obligations		8,035		—		8,035		—
U.S. agency obligations		199,586		175,345		24,241		—
Derivatives – currency forward contracts		444		—		444		—

Total assets	$	422,210	$	383,807	$	38,403	$	—

Liabilities:
Derivatives – currency forward contracts	$	827	$	—	$	827	$	—

Reported as follows:
Assets:
Cash and cash equivalents (1)	$	207,884	$	207,700	$	184	$	—
Short-term investments (2)		196,314		166,574		29,740		—
Other current assets		444		—		444		—

Total current assets	$	404,642	$	374,274	$	30,368	$	—

Long-term investments	$	17,568	$	9,533	$	8,035	$	—

Liabilities:
Other current liabilities	$	827	$	—	$	827	$	—

(1)	The cash and cash equivalent amounts presented in the table above do not include cash of $167,364 and non-negotiable time deposits of $33,968 as of June 30, 2012.

(2)	The short-term investments presented in the table above do not include non-negotiable time deposits of $36 as of June 30, 2012.

Assets and liabilities of the Company are measured at fair value on a recurring basis as of December 31, 2011, are summarized as follows:


			Fair Value Measurements at Reporting Date Using
Description	December 31, 2011		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market funds	$	137,976	$	137,976	$	—	$	—
Trading securities:
Mutual funds		635		635		—		—
Available-for-sale securities:
Bankers’ acceptance drafts		962		—		962		—
U.S. treasury obligations		29,404		—		29,404		—
U.S. agency obligations		229,438		147,546		81,892		—
Derivatives – currency forward contracts		531		—		531		—

Total assets	$	398,946	$	286,157	$	112,789	$	—

Liabilities:
Derivatives – currency forward contracts	$	1,054	$	—	$	1,054	$	—

Reported as follows:
Assets:
Cash and cash equivalents (1)	$	137,976	$	137,976	$	—	$	—
Short-term investments (2)		252,566		140,308		112,258		—
Other current assets		531		—		531		—

Total current assets	$	391,073	$	278,284	$	112,789	$	—

Long-term investments	$	7,873	$	7,873	$	—	$	—

Liabilities:
Other current liabilities	$	1,054	$	—	$	1,054	$	—

(1)	The cash and cash equivalent amounts presented in the table above do not include cash of $146,035 and non-negotiable time deposits of $28,905 as of December 31, 2011.

(2)	The short-term investments presented in the table above do not include non-negotiable time deposits of $37 as of December 31, 2011.

Money Market Funds

Money market funds are cash and cash equivalents and are classified within Level 1 of the fair value hierarchy.

Trading Mutual Fund Investments

As of June 30, 2012 and December 31, 2011, trading investments consisted of certain U.S. and international equity mutual funds and government agency fixed income mutual funds. During 2011, management changed the designation of the investments from available-for-sale to trading investments.

Bankers’ Acceptance Drafts

Bankers’ acceptance drafts are short-term credit investments created by a non-financial firm and guaranteed by a bank. These drafts are often traded at a discount from face value and may be traded on a secondary market.

Available-For-Sale Investments

As of June 30, 2012 and December 31, 2011, available-for-sale investments consisted of time deposits and drafts denominated in the Euro currency, U.S. treasury obligations and U.S. agency obligations. U.S. agency obligations include certain corporate obligations issued under the government’s Term Loan Guarantee Program which removed any credit risk associated with the corporate issuing entity, as they become obligations of the U.S. government should the corporate issuer be unable to honor its obligations.

The Company measures its debt and equity investments at fair value. The Company’s available-for-sale investments are classified within Level 1 and Level 2 of the fair value hierarchy.

Derivatives

As a result of the Company’s global operating activities, the Company is exposed to market risks from changes in foreign currency exchange rates, which may adversely affect its operating results and financial position. When deemed appropriate, the Company minimizes its risks from foreign currency exchange rate fluctuations through the use of derivative financial instruments. The principal market in which the Company executes its foreign currency contracts is the institutional market in an over-the-counter environment with a relatively high level of price transparency. The market participants usually are large commercial banks. The forward foreign currency exchange contracts are valued using broker quotations, or market transactions and are classified within Level 2 of the fair value hierarchy.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Derivatives

6 Months Ended

Jun. 30, 2012

Derivatives [Abstract]

Derivatives

5)	Derivatives

The Company enters into derivative instruments for risk management purposes only, including derivatives designated as hedging instruments and those utilized as economic hedges. The Company operates internationally and, in the normal course of business, is exposed to fluctuations in interest rates and foreign exchange rates. These fluctuations can increase the costs of financing, investing and operating the business. The Company has used derivative instruments, such as forward contracts, to manage certain foreign currency exposure.

By nature, all financial instruments involve market and credit risks. The Company enters into derivative instruments with major investment grade financial institutions and no collateral is required. The Company has policies to monitor the credit risk of these counterparties. While there can be no assurance, the Company does not anticipate any material non-performance by any of these counterparties.

The Company hedges a portion of its forecasted foreign currency denominated intercompany sales of inventory, over a maximum period of eighteen months, using forward foreign exchange contracts accounted for as cash-flow hedges related to Japanese, South Korean, British and European currencies. To the extent these derivatives are effective in off-setting the variability of the hedged cash flows, and otherwise meet the hedge accounting criteria, changes in the derivatives’ fair value are not included in current earnings but are included in other comprehensive income (“OCI”) in stockholders’ equity. These changes in fair value will subsequently be reclassified into earnings, as applicable, when the forecasted transaction occurs. To the extent that a previously designated hedging transaction is no longer an effective hedge, any ineffectiveness measured in the hedging relationship is recorded currently in earnings in the period it occurs. The cash flows resulting from forward exchange contracts are classified in the consolidated statements of cash flows as part of cash flows from operating activities. The Company does not enter into derivative instruments for trading or speculative purposes.

To the extent the hedge accounting criteria is not met, the related foreign currency forward contracts are considered as economic hedges and changes in the fair value of these contracts are recorded immediately in earnings in the period in which they occur. These include hedges that are used to reduce exchange rate risks arising from the change in fair value of certain foreign currency denominated assets and liabilities (i.e., payables, receivables) and other economic hedges where the hedge accounting criteria were not met.

As of June 30, 2012 and December 31, 2011, the Company had outstanding forward foreign exchange contracts with gross notional values of $51,575 and $36,119, respectively. The following tables provide a summary of the primary net hedging positions and corresponding fair values held as of June 30, 2012 and December 31, 2011:


	June 30, 2012
Currency Hedged (Buy/Sell)	Gross Notional Value		Fair Value (1)
U.S. Dollar/Japanese Yen	$	23,848	$	(107	)
U.S. Dollar/South Korean Won		19,893		(471	)
U.S. Dollar/Euro		4,025		181
U.S. Dollar/U.K. Pound Sterling		3,809		14

Total	$	51,575	$	(383	)


	December 31, 2011
Currency Hedged (Buy/Sell)	Gross Notional Value		Fair Value (1)
U.S. Dollar/Japanese Yen	$	18,676	$	(961	)
U.S. Dollar/South Korean Won		10,799		60
U.S. Dollar/Euro		3,869		288
U.S. Dollar/U.K. Pound Sterling		2,775		90

Total	$	36,119	$	(523	)

(1)	Represents the net receivable (payable) amount included in the consolidated balance sheets.

The following table provides a summary of the fair value amounts of the Company’s derivative instruments:


Derivatives Designated as Hedging Instruments	June 30, 2012			December 31, 2011
Derivative assets:
Forward exchange contracts	$	444		$	531
Derivative liabilities:
Forward exchange contracts		(827	)		(1,054	)

Total net derivative liability designated as hedging instruments (1)	$	(383	)	$	(523	)

(1)

The derivative asset of $444 and derivative liability of $827 are classified in other current assets and other current liabilities, respectively, in the consolidated balance sheet as of June 30, 2012. The derivative asset of $531 and derivative liability of $1,054 are classified in other current assets and other current liabilities, respectively, in the consolidated balance sheet as of December 31, 2011.

The following table provides a summary of the gains (losses) on derivatives designated as hedging instruments:


	Three Months Ended June 30,						Six Months Ended June 30,
Derivatives Designated as Cash Flow Hedging Relationships	2012			2011			2012			2011
Forward exchange contracts:
Net (loss) gain recognized in OCI (1)	$	(1,065	)	$	(157	)	$	398		$	(319	)
Net gain (loss) reclassified from OCI into income (2)		74			(949	)		(439	)		(1,475	)

(1)	Net change in the fair value of the effective portion classified in OCI.

(2)	Effective portion classified in selling, general and administrative expenses.

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

+ References

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-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Inventories

6 Months Ended

Jun. 30, 2012

Inventories [Abstract]

Inventories

6)	Inventories

Inventories consist of the following:


	June 30, 2012		December 31, 2011
Raw materials	$	80,239	$	78,501
Work-in-process		20,409		21,298
Finished goods		44,961		53,833

	$	145,609	$	153,632

Goodwill and Intangible Assets

6 Months Ended

Jun. 30, 2012

Goodwill and Intangible Assets [Abstract]

Goodwill and Intangible Assets

7)	Goodwill and Intangible Assets

Goodwill

The Company’s methodology for allocating the purchase price relating to purchase acquisitions is determined through established and generally accepted valuation techniques. Goodwill is measured as the excess of the cost of the acquisition over the sum of the amounts assigned to tangible and identifiable intangible assets acquired less liabilities assumed. The Company assigns assets acquired (including goodwill) and liabilities assumed to one or more reporting units as of the date of acquisition. Typically acquisitions relate to a single reporting unit and thus do not require the allocation of goodwill to multiple reporting units. If the products obtained in an acquisition are assigned to multiple reporting units, the goodwill is distributed to the respective reporting units as part of the purchase price allocation process.

Goodwill and purchased intangible assets with indefinite useful lives are not amortized, but are reviewed for impairment annually during the fourth quarter of each fiscal year and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. The process of evaluating the potential impairment of goodwill and intangible assets requires significant judgment. The Company regularly monitors current business conditions and other factors including, but not limited to, adverse industry or economic trends, restructuring actions and lower projections of profitability that may impact future operating results.

As of October 31, 2011, the Company performed its annual impairment assessment of goodwill and determined that there was no impairment.

The changes in the carrying amount of goodwill and accumulated impairment losses during the six months ended June 30, 2012 and twelve months ended December 31, 2011 were as follows:


	2012							2011
	Gross Carrying Amount		Accumulated Impairment Loss			Net		Gross Carrying Amount		Accumulated Impairment Loss			Net
Beginning balance at January 1	$	279,498	$	(139,414	)	$	140,084	$	279,434	$	(139,414	)	$	140,020
Acquired goodwill (1)		—		—			—		64		—			64

Ending balance at June 30, 2012 and December 31, 2011	$	279,498	$	(139,414	)	$	140,084	$	279,498	$	(139,414	)	$	140,084

(1)	In September 2011, the Company purchased a product line from GE Osmonics, Inc. for $458. The Company recorded $315 of intangible assets and $64 of goodwill in connection with the acquisition.

Intangible Assets

Components of the Company’s intangible assets are comprised of the following:


As of June 30, 2012:	Gross		Accumulated Amortization			Net
Completed technology (1)	$	77,055	$	(76,853	)	$	202
Customer relationships		9,190		(8,550	)		640
Patents, trademarks, trade names and other		24,703		(24,514	)		189

	$	110,948	$	(109,917	)	$	1,031


As of December 31, 2011:	Gross		Accumulated Amortization			Net
Completed technology	$	76,829	$	(76,829	)	$	—
Customer relationships		9,190		(8,393	)		797
Patents, trademarks, trade names and other		24,703		(24,457	)		246

	$	110,722	$	(109,679	)	$	1,043

(1)	Intangible assets of $226 were re-classified from other assets to intangible assets during the quarter ended March 31, 2012. This related to in-process research and development which was completed during the first quarter of 2012, related to a previous acquisition.

Aggregate amortization expense related to acquired intangibles for the three and six months ended June 30, 2012 was $119 and $238, respectively. Aggregate amortization expense related to intangible assets for the three and six months ended June 30, 2011 was $250 and $500, respectively. Estimated amortization expense for the remainder of the fiscal year, each of the next five fiscal years and thereafter is as follows:


Year	Amount
2012 (remaining)	$	238
2013		475
2014		97
2015		81
2016		81
2017		36
Thereafter		23

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Debt

6 Months Ended

Jun. 30, 2012

Debt [Abstract]

Debt

The Company’s Japanese subsidiary has lines of credit and short-term borrowing arrangements with two financial institutions which provide for aggregate borrowings as of June 30, 2012 of up to an equivalent of $31,462 U.S. dollars, at an average interest rate of 0.65%, which generally expire and are renewed at three month intervals. There were no borrowings outstanding under these arrangements at June 30, 2012. There were $1,932 total borrowings outstanding under these arrangements at December 31, 2011.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Product Warranties

6 Months Ended

Jun. 30, 2012

Commitments and Contingencies/Product Warranties [Abstract]

Product Warranties

9)	Product Warranties

The Company provides for the estimated costs to fulfill customer warranty obligations upon the recognition of the related revenue. While the Company engages in extensive product quality programs and processes, including actively monitoring and evaluating the quality of its component suppliers, the Company’s warranty obligation is affected by shipment volume, product failure rates, utilization levels, material usage, and supplier warranties on parts delivered to the Company. Should actual product failure rates, utilization levels, material usage, or supplier warranties on parts differ from the Company’s estimates, revisions to the estimated warranty liability would be required. The product warranty liability is included in other current liabilities in the consolidated balance sheets.

Product warranty activities were as follows:


	Six Months Ended June 30,
	2012			2011
Balance at January 1	$	8,315		$	9,865
Provision for product warranties		2,886			3,638
Direct charges to warranty liability		(2,475	)		(3,832	)

Balance at June 30	$	8,726		$	9,671

Income Taxes

6 Months Ended

Jun. 30, 2012

Income Taxes [Abstract]

Income Taxes

10)	Income Taxes

The Company’s effective tax rate for the three and six months ended June 30, 2012 was 33.7% and 32.9%, respectively. The Company’s effective tax rates for both the three and six months ended June 30, 2011 was 33.0%. The effective tax rates for the six months ended June 30, 2012 and 2011, and the related income tax provisions were lower than the U.S. statutory tax rate primarily due to the geographic mix of income and profits earned by the Company’s international subsidiaries being taxed at rates lower than the U.S. statutory rate.

At June 30, 2012, the total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $37,505. At December 31, 2011, the total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $35,151. The net increase from December 31, 2011 was attributable to an increase in reserves for existing uncertain tax positions. If these benefits were recognized in a future period, the timing of which is not estimable, the net unrecognized tax benefit of $16,864, excluding interest and penalties, would impact the Company’s effective tax rate as of June 30, 2012. The Company accrues interest expense and, if applicable, penalties for any uncertain tax positions. Interest and penalties are classified as a component of income tax expense. At June 30, 2012 and December 31, 2011, the Company had accrued interest on unrecognized tax benefits of approximately $1,294 and $973, respectively.

The Company and its subsidiaries are subject to examination by federal, state and foreign tax authorities. The Internal Revenue Service commenced an examination of its U.S. federal tax filings for open tax years through 2009 during the quarter ended June 30, 2012. The statute of limitations for the Company’s tax filings varies by tax jurisdiction between fiscal years 2001 through present.

While the Company believes it has adequately provided for all tax positions, amounts asserted by taxing authorities could materially differ from the Company’s accrued positions as a result of uncertain and complex application of tax regulations. Additionally, the recognition and measurement of certain tax benefits include estimates and judgment by management and inherently includes subjectivity. Accordingly, the Company may record additional provisions or benefits due to U.S. federal, state, and foreign tax-related matters in the future as it revises estimates or settles or otherwise resolves the underlying matters.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

+ Details

Net Income Per Share

6 Months Ended

Jun. 30, 2012

Net Income Per Share [Abstract]

Net Income Per Share

11)	Net Income Per Share

The following table sets forth the computation of basic and diluted net income per share:


	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Numerator:
Net income	$	18,572	$	38,601	$	41,340	$	76,644

Denominator:
Shares used in net income per common share – basic		52,679,000		52,346,000		52,591,000		51,877,000
Effect of dilutive securities:
Stock options, restricted stock and employee stock purchase plan		527,000		560,000		623,000		769,000

Shares used in net income per common share – diluted		53,206,000		52,906,000		53,214,000		52,646,000

Net income per common share:
Basic	$	0.35	$	0.74	$	0.79	$	1.48
Diluted	$	0.35	$	0.73	$	0.78	$	1.46

Basic earnings per share (“EPS”) is computed by dividing income available to common stockholders by the weighted-average number of common shares outstanding during the period. The computation of diluted EPS is similar to the computation of basic EPS except that the denominator is increased to include the number of additional common shares that would have been outstanding (using the treasury stock method) if securities containing potentially dilutive common shares (stock options and restricted stock units) had been converted to such common shares, and if such assumed conversion is dilutive.

As of June 30, 2012, stock options and restricted stock units relating to an aggregate of approximately 1,277,000 shares were outstanding. For the three and six months ended June 30, 2012, the potential dilutive effect of 479,000 and 288,000 weighted-average shares, respectively, of restricted stock units and stock options were excluded from the computation of diluted weighted-average shares outstanding as the shares would have an anti-dilutive effect on EPS.

As of June 30, 2011, stock options and restricted stock units relating to an aggregate of approximately 1,638,000 shares were outstanding. For the three and six months ended June 30, 2011, the potential dilutive effect of 331,000 and 256,000 weighted-average shares, respectively, of restricted stock units and stock options were excluded from the computation of diluted weighted-average shares outstanding as the shares would have an anti-dilutive effect on EPS.

Stockholder's Equity

6 Months Ended

Jun. 30, 2012

Stockholder's Equity [Abstract]

Stockholder's Equity

12)	Stockholder’s Equity

Stock Repurchase Program

On July 25, 2011, MKS’ Board of Directors approved a share repurchase program for the repurchase of up to an aggregate of $200,000 of its outstanding common stock from time to time in open market purchases, privately negotiated transactions or through other appropriate means. The timing and quantity of any shares repurchased will depend upon a variety of factors, including business conditions, stock market conditions and business development activities, including but not limited to merger and acquisition opportunities. These repurchases may be commenced, suspended or discontinued at any time without prior notice.

During the six months ended June 30, 2012, the Company repurchased 168,000 shares of its common stock for $4,960 for an average price of $29.52 per share.

Cash Dividends

Holders of the Company’s common stock are entitled to receive dividends when they are declared by the Company’s Board of Directors. During the six months ended June 30, 2012, the Board of Directors declared two quarterly dividends of $0.15 per share, which totaled $15,806 or $0.30 per share. Future dividend declarations, if any, as well as the record and payment dates for such dividends, are subject to the final determination of our Board of Directors.

On July 30, 2012, the Company’s Board of Directors declared a quarterly cash dividend of $0.16 per share to be paid on September 14, 2012 to shareholders of record as of August 31, 2012.

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section B
-Paragraph 7, 11A
-Chapter 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph d
-Article 4

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Business Segment, Geographic Area, Product and Significant Customer Information

6 Months Ended

Jun. 30, 2012

Business Segment, Geographic Area, Product and Significant Customer Information [Abstract]

Business Segment, Geographic Area, Product and Significant Customer Information

13)	Business Segment, Geographic Area, Product and Significant Customer Information

Effective in the second quarter of fiscal year 2012, the Company changed its financial reporting structure to include four reportable segments based upon the manner in which information is produced internally and provided to the Company’s chief operating decision-maker (“CODM”). The Company had previously reported as a single operating and reporting segment.

The Company develops, manufactures, sells and services products that measure, control, power and monitor critical parameters of advanced manufacturing processes. The Company’s CODM utilizes consolidated financial information to make decisions about allocating resources and assessing performance for the entire Company. In addition, certain disaggregated financial information is also provided to the CODM. Based upon the information provided to the CODM, the Company has determined it has eight operating segments and four reportable segments.

The eight operating segments are PFMC Products, Controls Products, ASTeX Products, ENI Products, HPS Products, Analytical Solutions Group (“ASG”) Products, Asia Region Sales & Service and Europe Region Sales & Service.

PFMC Products, Controls Products, ASTeX Products, ENI Products and HPS Products comprise a single reportable segment due to the similarities of the segments. This reportable segment, Advanced Manufacturing Capital Equipment, includes the development, manufacturing, sales and servicing of instruments and control products, power and reactive gas products, and vacuum products, all of which are utilized in semiconductor processing and other similar advanced manufacturing processes. Sales in this segment include both external sales and intercompany sales (which are stated at agreed upon transfer prices). External sales of these products made in Europe or Asia are reported as sales in the Europe Region Sales & Service or Asia Region Sales & Service segments.

ASG Products, Asia Region Sales & Service and Europe Region Sales & Service are each separate reportable segments. The Company has reported corporate expenses and certain intercompany pricing transactions in a Corporate, Eliminations and Other reconciling column. The ASG Product group includes materials delivery, gas composition analysis and information technology products. The Europe and Asia sales and service segments mainly resell and service the Advanced Manufacturing Capital Equipment and ASG products sold in their respective regions.

MKS derives the segment results directly from the manner in which results are reported in its management reporting system. The accounting policies MKS uses to derive reportable segment results are substantially the same as those used for external reporting purposes except that a substantial portion of the sales of the Advanced Manufacturing Capital Equipment and ASG products segments are intercompany sales to the regions at tax-based transfer prices and certain significant costs, including stock-based compensation and management incentive compensation, are not allocated to the segments and are included in Corporate, Eliminations and Other. The CODM reviews several metrics of each operating segment, including net sales and gross profit (loss).

The following is net revenues by reportable segment:


	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Advanced Manufacturing Capital Equipment	$	134,601		$	189,674		$	277,824		$	381,412
Analytical Solutions Group		16,727			14,918			32,521			30,144
Europe Sales & Service Operations (1)		12,449			20,759			24,656			42,164
Asia Sales & Service Operations (1)		63,783			80,035			135,882			168,841
Corporate, Eliminations and Other		(50,163	)		(80,899	)		(102,618	)		(166,223	)

	$	177,397		$	224,487		$	368,265		$	456,338

The following is gross profit by reportable segment:


	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Advanced Manufacturing Capital Equipment	$	48,858	$	79,816	$	106,695	$	160,121
Analytical Solutions Group		8,284		7,511		16,384		15,247
Europe Sales & Service Operations (1)		3,742		5,354		7,745		11,249
Asia Sales & Service Operations (1)		11,851		11,513		19,113		24,248
Corporate, Eliminations and Other		3,781		794		10,370		484

	$	76,516	$	104,988	$	160,307	$	211,349

(1)

The Europe and Asia foreign sales and service operations do not represent total geographical Europe and Asia financial information. These sales and service operations only represent the sales from the resale and service of Advanced Manufacturing Capital Equipment and Analytical Solutions Group products in their respective regions. The Advanced Manufacturing Capital Equipment and Analytical Solutions Group segments both have sales in each region. Accordingly, total geographical sales include sales from multiple reportable segments.

The following is capital expenditures by reportable segment for the three and six months ended June 30, 2012 and 2011:


	Product Groups				Foreign Sales & Service Operations
	Advanced Manufacturing Capital Equipment		Analytical Solutions Group		Europe		Asia		Corporate, Eliminations and Other		Total
Three Months Ended June 30, 2012:
Capital expenditures	$	1,464	$	300	$	29	$	124	$	1,528	$	3,445

Six Months Ended June 30, 2012:
Capital expenditures	$	4,639	$	415	$	74	$	417	$	2,467	$	8,012



	Product Groups				Foreign Sales & Service Operations
	Advanced Manufacturing Capital Equipment		Analytical Solutions Group		Europe		Asia		Corporate, Eliminations and Other		Total
Three Months Ended June 30, 2011:
Capital expenditures	$	2,912	$	136	$	70	$	389	$	427	$	3,934

Six Months Ended June 30, 2011:
Capital expenditures	$	4,764	$	220	$	127	$	476	$	678	$	6,265

The following is segment assets by reportable segment:


	Product Groups				Foreign Sales & Service Operations
	Advanced Manufacturing Capital Equipment		Analytical Solutions Group		Europe		Asia		Corporate, Eliminations and Other			Total
June 30, 2012:
Segment assets:
Accounts receivable	$	13,333	$	5,937	$	6,437	$	45,632	$	33,488		$	104,827
Inventory		117,862		4,479		3,662		33,552		(13,946	)		145,609

Total segment assets	$	131,195	$	10,416	$	10,099	$	79,184	$	19,542		$	250,436


	Product Groups				Foreign Sales & Service Operations
	Advanced Manufacturing Capital Equipment		Analytical Solutions Group		Europe		Asia		Corporate, Eliminations and Other			Total
December 31, 2011:
Segment assets:
Accounts receivable	$	24,224	$	5,099	$	6,079	$	60,242	$	25,250		$	120,894
Inventory		119,314		4,442		3,828		45,828		(19,780	)		153,632

Total segment assets	$	143,538	$	9,541	$	9,907	$	106,070	$	5,470		$	274,526

A reconciliation of segment assets to consolidated total assets is as follows:


	June 30, 2012		December 31, 2011
Total segment assets	$	250,436	$	274,526
Cash and cash equivalents and investments		623,134		573,392
Other current assets		35,594		44,856
Property, plant and equipment, net		73,983		72,487
Goodwill and intangible assets, net		141,115		141,127
Other assets		10,658		12,266

Consolidated total assets	$	1,134,920	$	1,118,654

Worldwide Product Information

Because the reportable segment information above does not reflect worldwide sales of the Company’s products, the Company groups its products into four groups of similar products based upon the similarity of product function. Worldwide net revenue for each group of products is as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Instruments and Control Products	$	71,589	$	103,671	$	147,888	$	199,594
Power and Reactive Gas Products		70,267		83,523		147,833		180,005
Vacuum Products		17,695		21,411		37,723		44,644
Analytical Solutions Group Products		17,846		15,882		34,821		32,095

	$	177,397	$	224,487	$	368,265	$	456,338

Sales of Instruments and Control Products, Power and Reactive Gas Products and Vacuum Products are included in the Company’s Advanced Manufacturing Capital Equipment Products segment as well as in the foreign sales and service operations because the products are sold through the foreign sales and service operations in their respective regions. Sales of the Analytical Solutions Group Products are included in the Analytical Solutions Group segment as well as in the foreign sales and service operations because the products are sold through the foreign sales and service operations in their respective regions.

Geographic

Information about the Company’s operations in different geographic regions is presented in the tables below. Net sales to unaffiliated customers are based on the location in which the sale originated. Transfers between geographic areas are at negotiated transfer prices and have been eliminated from consolidated net sales.


	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Net revenues
United States	$	91,075	$	110,412	$	186,179	$	221,015
Japan		19,419		27,551		52,852		52,190
Europe		22,474		30,852		44,459		60,556
Asia (excluding Japan)		44,429		55,672		84,775		122,577

	$	177,397	$	224,487	$	368,265	$	456,338


	June 30, 2012		December 31, 2011
Long-lived assets (1)
United States	$	59,022	$	56,760
Japan		3,474		3,908
Europe		5,369		5,437
Asia (excluding Japan)		7,927		8,374

	$	75,792	$	74,479

(1)	Long-lived assets include property, plant and equipment, net and certain other assets.

Major Customers

The Company had two customers with net revenues greater than 10% of total net revenues as follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Customer A		14.9	%		14.1	%		14.7	%		14.0	%
Customer B		11.3	%		9.2	%		11.0	%		9.5	%

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Commitments and Contingencies

6 Months Ended

Jun. 30, 2012

Commitments and Contingencies/Product Warranties [Abstract]

Commitments and Contingencies

14)	Commitments and Contingencies

The Company is subject to various legal proceedings and claims, which have arisen in the ordinary course of business. In the opinion of management, the ultimate disposition of these matters will not have a material adverse effect on the Company’s results of operations, financial condition or cash flows.

The Company reviewed its contractual obligations and commercial commitments as of June 30, 2012 and determined that there were no significant changes from the ones set forth in the notes to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2011 other than as follows:

A lawsuit was filed against the Company and certain of its affiliates by a former shareholder of a former subsidiary of the Company. The complaint alleges certain claims against the Company including breach of contract and implied covenants, and statutory violations. The claims seek unspecified damages and equitable relief. The Company believes that it has meritorious factual and legal defenses to the allegations raised and intends to defend this matter vigorously. While management does not believe that any loss will be material to its financial position or liquidity, there can be no assurance that any such loss won't be material to any one reporting period.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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-Publisher FASB
-Name FASB Interpretation (FIN)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Investments (Tables)

6 Months Ended

Jun. 30, 2012

Investments [Abstract]

Fair value of short-term available-for-sale investments

<table cellspacing="0" cellpadding="0" width="100%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="70%"> </td> <td valign="bottom" width="8%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="8%"> </td> <td> </td> <td> </td> <td> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">June 30, 2012</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">December 31, 2011</td> <td valign="bottom"> </td> </tr>   <tr bgcolor="#cceeff"> <td valign="top"> Available-for-sale investments: </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> </tr> <tr> <td valign="top"> Time deposits </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">36</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">37</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Bankers’ acceptance drafts </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">5,499</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">962</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> U.S. treasury obligations </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">— </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">29,404</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> U.S. agency obligations </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">190,053</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">221,565</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td> </td> </tr> <tr> <td valign="top"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">195,588</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">251,968</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td height="8"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Trading investments: </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> </tr> <tr> <td valign="top"> Mutual funds </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">762</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">635</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">196,350</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">252,603</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td> </td> </tr>  </table>

Fair value of long-term available-for-sale investments


	June 30, 2012		December 31, 2011
U.S. treasury obligations	$	8,035	$	—
U.S. agency obligations		9,533		7,873

	$	17,568	$	7,873

Gross unrealized gains and (losses) aggregated by investment category short-term and long-term available for sale securities


As of June 30, 2012:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Time deposits	$	36	$	—	$	—		$	36
Bankers’ acceptance drafts		5,499		—		—			5,499
U.S. agency obligations		190,082		17		(46	)		190,053

	$	195,617	$	17	$	(46	)	$	195,588

Long-term investments:
U.S. treasury obligations		8,033		2		—			8,035
U.S. agency obligations		9,532		1		—			9,533

	$	17,565	$	3	$	—		$	17,568


As of December 31, 2011:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Time deposits	$	37	$	—	$	—		$	37
Bankers’ acceptance drafts		962		—		—			962
U.S. treasury obligations		29,393		11		—			29,404
U.S. agency obligations		221,516		56		(7	)		221,565

	$	251,908	$	67	$	(7	)	$	251,968

Long-term investments:
U.S. agency obligations	$	7,876	$	—	$	(3	)	$	7,873

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value Measurements [Abstract]

Schedule of fair value assets and liabilities measured on recurring basis


			Fair Value Measurements at Reporting Date Using
Description	June 30, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market funds	$	207,700	$	207,700	$	—	$	—
Bankers’ acceptance drafts		184		—		184		—
Trading securities:
Mutual funds		762		762		—		—
Available-for-sale securities:
Bankers’ acceptance drafts		5,499		—		5,499		—
U.S. treasury obligations		8,035		—		8,035		—
U.S. agency obligations		199,586		175,345		24,241		—
Derivatives – currency forward contracts		444		—		444		—

Total assets	$	422,210	$	383,807	$	38,403	$	—

Liabilities:
Derivatives – currency forward contracts	$	827	$	—	$	827	$	—

Reported as follows:
Assets:
Cash and cash equivalents (1)	$	207,884	$	207,700	$	184	$	—
Short-term investments (2)		196,314		166,574		29,740		—
Other current assets		444		—		444		—

Total current assets	$	404,642	$	374,274	$	30,368	$	—

Long-term investments	$	17,568	$	9,533	$	8,035	$	—

Liabilities:
Other current liabilities	$	827	$	—	$	827	$	—

(1)	The cash and cash equivalent amounts presented in the table above do not include cash of $167,364 and non-negotiable time deposits of $33,968 as of June 30, 2012.

(2)	The short-term investments presented in the table above do not include non-negotiable time deposits of $36 as of June 30, 2012.

Assets and liabilities of the Company are measured at fair value on a recurring basis as of December 31, 2011, are summarized as follows:


			Fair Value Measurements at Reporting Date Using
Description	December 31, 2011		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market funds	$	137,976	$	137,976	$	—	$	—
Trading securities:
Mutual funds		635		635		—		—
Available-for-sale securities:
Bankers’ acceptance drafts		962		—		962		—
U.S. treasury obligations		29,404		—		29,404		—
U.S. agency obligations		229,438		147,546		81,892		—
Derivatives – currency forward contracts		531		—		531		—

Total assets	$	398,946	$	286,157	$	112,789	$	—

Liabilities:
Derivatives – currency forward contracts	$	1,054	$	—	$	1,054	$	—

Reported as follows:
Assets:
Cash and cash equivalents (1)	$	137,976	$	137,976	$	—	$	—
Short-term investments (2)		252,566		140,308		112,258		—
Other current assets		531		—		531		—

Total current assets	$	391,073	$	278,284	$	112,789	$	—

Long-term investments	$	7,873	$	7,873	$	—	$	—

Liabilities:
Other current liabilities	$	1,054	$	—	$	1,054	$	—

(1)	The cash and cash equivalent amounts presented in the table above do not include cash of $146,035 and non-negotiable time deposits of $28,905 as of December 31, 2011.

(2)	The short-term investments presented in the table above do not include non-negotiable time deposits of $37 as of December 31, 2011.

Derivatives (Tables)

6 Months Ended

Jun. 30, 2012

Derivatives [Abstract]

Summary of the primary net hedging positions and corresponding fair values


	June 30, 2012
Currency Hedged (Buy/Sell)	Gross Notional Value		Fair Value (1)
U.S. Dollar/Japanese Yen	$	23,848	$	(107	)
U.S. Dollar/South Korean Won		19,893		(471	)
U.S. Dollar/Euro		4,025		181
U.S. Dollar/U.K. Pound Sterling		3,809		14

Total	$	51,575	$	(383	)


	December 31, 2011
Currency Hedged (Buy/Sell)	Gross Notional Value		Fair Value (1)
U.S. Dollar/Japanese Yen	$	18,676	$	(961	)
U.S. Dollar/South Korean Won		10,799		60
U.S. Dollar/Euro		3,869		288
U.S. Dollar/U.K. Pound Sterling		2,775		90

Total	$	36,119	$	(523	)

(1)	Represents the net receivable (payable) amount included in the consolidated balance sheets.

Summary of the fair value amounts of the Company's derivative instruments


Derivatives Designated as Hedging Instruments	June 30, 2012			December 31, 2011
Derivative assets:
Forward exchange contracts	$	444		$	531
Derivative liabilities:
Forward exchange contracts		(827	)		(1,054	)

Total net derivative liability designated as hedging instruments (1)	$	(383	)	$	(523	)

(1)

Summary of the gain (losses) on derivatives designated as hedging instruments


	Three Months Ended June 30,						Six Months Ended June 30,
Derivatives Designated as Cash Flow Hedging Relationships	2012			2011			2012			2011
Forward exchange contracts:
Net (loss) gain recognized in OCI (1)	$	(1,065	)	$	(157	)	$	398		$	(319	)
Net gain (loss) reclassified from OCI into income (2)		74			(949	)		(439	)		(1,475	)

(1)	Net change in the fair value of the effective portion classified in OCI.

(2)	Effective portion classified in selling, general and administrative expenses.

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41641-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41638-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579240-113959

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(2))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41620-113959

+ Details

Inventories (Tables)

6 Months Ended

Jun. 30, 2012

Inventories [Abstract]

Inventories


	June 30, 2012		December 31, 2011
Raw materials	$	80,239	$	78,501
Work-in-process		20,409		21,298
Finished goods		44,961		53,833

	$	145,609	$	153,632

Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2012

Goodwill and Intangible Assets [Abstract]

Goodwill


	2012							2011
	Gross Carrying Amount		Accumulated Impairment Loss			Net		Gross Carrying Amount		Accumulated Impairment Loss			Net
Beginning balance at January 1	$	279,498	$	(139,414	)	$	140,084	$	279,434	$	(139,414	)	$	140,020
Acquired goodwill (1)		—		—			—		64		—			64

Ending balance at June 30, 2012 and December 31, 2011	$	279,498	$	(139,414	)	$	140,084	$	279,498	$	(139,414	)	$	140,084

(1)	In September 2011, the Company purchased a product line from GE Osmonics, Inc. for $458. The Company recorded $315 of intangible assets and $64 of goodwill in connection with the acquisition.

Intangible Assets


As of June 30, 2012:	Gross		Accumulated Amortization			Net
Completed technology (1)	$	77,055	$	(76,853	)	$	202
Customer relationships		9,190		(8,550	)		640
Patents, trademarks, trade names and other		24,703		(24,514	)		189

	$	110,948	$	(109,917	)	$	1,031


As of December 31, 2011:	Gross		Accumulated Amortization			Net
Completed technology	$	76,829	$	(76,829	)	$	—
Customer relationships		9,190		(8,393	)		797
Patents, trademarks, trade names and other		24,703		(24,457	)		246

	$	110,722	$	(109,679	)	$	1,043

(1)	Intangible assets of $226 were re-classified from other assets to intangible assets during the quarter ended March 31, 2012. This related to in-process research and development which was completed during the first quarter of 2012, related to a previous acquisition.

Estimated amortization expense


Year	Amount
2012 (remaining)	$	238
2013		475
2014		97
2015		81
2016		81
2017		36
Thereafter		23

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References + Details

Product Warranties (Tables)

6 Months Ended

Jun. 30, 2012

Commitments and Contingencies/Product Warranties [Abstract]

Product warranty activities


	Six Months Ended June 30,
	2012			2011
Balance at January 1	$	8,315		$	9,865
Provision for product warranties		2,886			3,638
Direct charges to warranty liability		(2,475	)		(3,832	)

Balance at June 30	$	8,726		$	9,671

Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2012

Net Income Per Share [Abstract]

Computation of basic and diluted net income per share


	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Numerator:
Net income	$	18,572	$	38,601	$	41,340	$	76,644

Denominator:
Shares used in net income per common share – basic		52,679,000		52,346,000		52,591,000		51,877,000
Effect of dilutive securities:
Stock options, restricted stock and employee stock purchase plan		527,000		560,000		623,000		769,000

Shares used in net income per common share – diluted		53,206,000		52,906,000		53,214,000		52,646,000

Net income per common share:
Basic	$	0.35	$	0.74	$	0.79	$	1.48
Diluted	$	0.35	$	0.73	$	0.78	$	1.46

Business Segment, Geographic Area, Product and Significant Customer Information [Tables]

6 Months Ended

Jun. 30, 2012

Business Segment, Geographic Area, Product and Significant Customer Information [Abstract]

Net revenues by reportable segment


	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Advanced Manufacturing Capital Equipment	$	134,601		$	189,674		$	277,824		$	381,412
Analytical Solutions Group		16,727			14,918			32,521			30,144
Europe Sales & Service Operations (1)		12,449			20,759			24,656			42,164
Asia Sales & Service Operations (1)		63,783			80,035			135,882			168,841
Corporate, Eliminations and Other		(50,163	)		(80,899	)		(102,618	)		(166,223	)

	$	177,397		$	224,487		$	368,265		$	456,338

Schedule of gross profit (loss) by reportable segment


	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Advanced Manufacturing Capital Equipment	$	48,858	$	79,816	$	106,695	$	160,121
Analytical Solutions Group		8,284		7,511		16,384		15,247
Europe Sales & Service Operations (1)		3,742		5,354		7,745		11,249
Asia Sales & Service Operations (1)		11,851		11,513		19,113		24,248
Corporate, Eliminations and Other		3,781		794		10,370		484

	$	76,516	$	104,988	$	160,307	$	211,349

(1)

Schedule of capital expenditures and segment assets by reportable segment


	Product Groups				Foreign Sales & Service Operations
	Advanced Manufacturing Capital Equipment		Analytical Solutions Group		Europe		Asia		Corporate, Eliminations and Other		Total
Three Months Ended June 30, 2012:
Capital expenditures	$	1,464	$	300	$	29	$	124	$	1,528	$	3,445

Six Months Ended June 30, 2012:
Capital expenditures	$	4,639	$	415	$	74	$	417	$	2,467	$	8,012



	Product Groups				Foreign Sales & Service Operations
	Advanced Manufacturing Capital Equipment		Analytical Solutions Group		Europe		Asia		Corporate, Eliminations and Other		Total
Three Months Ended June 30, 2011:
Capital expenditures	$	2,912	$	136	$	70	$	389	$	427	$	3,934

Six Months Ended June 30, 2011:
Capital expenditures	$	4,764	$	220	$	127	$	476	$	678	$	6,265


	Product Groups				Foreign Sales & Service Operations
	Advanced Manufacturing Capital Equipment		Analytical Solutions Group		Europe		Asia		Corporate, Eliminations and Other			Total
June 30, 2012:
Segment assets:
Accounts receivable	$	13,333	$	5,937	$	6,437	$	45,632	$	33,488		$	104,827
Inventory		117,862		4,479		3,662		33,552		(13,946	)		145,609

Total segment assets	$	131,195	$	10,416	$	10,099	$	79,184	$	19,542		$	250,436


	Product Groups				Foreign Sales & Service Operations
	Advanced Manufacturing Capital Equipment		Analytical Solutions Group		Europe		Asia		Corporate, Eliminations and Other			Total
December 31, 2011:
Segment assets:
Accounts receivable	$	24,224	$	5,099	$	6,079	$	60,242	$	25,250		$	120,894
Inventory		119,314		4,442		3,828		45,828		(19,780	)		153,632

Total segment assets	$	143,538	$	9,541	$	9,907	$	106,070	$	5,470		$	274,526

Reconciliation of segment assets to consolidated total assets


	June 30, 2012		December 31, 2011
Total segment assets	$	250,436	$	274,526
Cash and cash equivalents and investments		623,134		573,392
Other current assets		35,594		44,856
Property, plant and equipment, net		73,983		72,487
Goodwill and intangible assets, net		141,115		141,127
Other assets		10,658		12,266

Consolidated total assets	$	1,134,920	$	1,118,654

Worldwide net revenue for each group of products


	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Instruments and Control Products	$	71,589	$	103,671	$	147,888	$	199,594
Power and Reactive Gas Products		70,267		83,523		147,833		180,005
Vacuum Products		17,695		21,411		37,723		44,644
Analytical Solutions Group Products		17,846		15,882		34,821		32,095

	$	177,397	$	224,487	$	368,265	$	456,338

Company's operations in different geographic regions


	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Net revenues
United States	$	91,075	$	110,412	$	186,179	$	221,015
Japan		19,419		27,551		52,852		52,190
Europe		22,474		30,852		44,459		60,556
Asia (excluding Japan)		44,429		55,672		84,775		122,577

	$	177,397	$	224,487	$	368,265	$	456,338


	June 30, 2012		December 31, 2011
Long-lived assets (1)
United States	$	59,022	$	56,760
Japan		3,474		3,908
Europe		5,369		5,437
Asia (excluding Japan)		7,927		8,374

	$	75,792	$	74,479

(1)	Long-lived assets include property, plant and equipment, net and certain other assets.

Customers with net revenues greater than 10% of total net revenues


	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Customer A		14.9	%		14.1	%		14.7	%		14.0	%
Customer B		11.3	%		9.2	%		11.0	%		9.5	%

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Available-for-sale investments:
Fair value of short-term available-for-sale investments	$ 195,588	$ 251,968
Short-term investments:
Fair value of short-term investments	196,350	252,603
Fair value of long-term available-for-sale investments
Fair value of long-term available-for-sale investments	17,568	7,873
Time deposits [Member]
Available-for-sale investments:
Fair value of short-term available-for-sale investments	36	37
Bankers' acceptance drafts [Member]
Available-for-sale investments:
Fair value of short-term available-for-sale investments	5,499	962
U.S. treasury obligations [Member]
Available-for-sale investments:
Fair value of short-term available-for sale		29,404
Fair value of long-term available-for-sale investments
Fair value of long-term available-for-sale investments	8,035
U.S. agency obligations [Member]
Available-for-sale investments:
Fair value of short-term available-for sale	190,053	221,565
Fair value of long-term available-for-sale investments
Fair value of long-term available-for-sale investments	9,533	7,873
Mutual funds [Member]
Short-term investments:
Fair value of short-term investments, mutual funds	$ 762	$ 635

Investments (Details 1) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Gross unrealized gains and (losses) aggregated by investment category
Short-term Investments, Cost	$ 195,617	$ 251,908
Short-term Investments, Gross Unrealized Gains	17	67
Short-term Investments, Gross Unrealized (Losses)	(46)	(7)
Short-term Investments, Estimated Fair Value	195,588	251,968
Long-term investments, Cost	17,565	7,876
Long-term investments, Gross Unrealized Gains	3
Long-term Investments, Gross Unrealized (Losses)		(3)
Long-term Investments, Estimated Fair Value	17,568	7,873
Time deposits [Member]
Gross unrealized gains and (losses) aggregated by investment category
Short-term Investments, Cost	36	37
Short-term Investments, Gross Unrealized Gains
Short-term Investments, Gross Unrealized (Losses)
Short-term Investments, Estimated Fair Value	36	37
Bankers' acceptance drafts [Member]
Gross unrealized gains and (losses) aggregated by investment category
Short-term Investments, Cost	5,499	962
Short-term Investments, Gross Unrealized Gains
Short-term Investments, Gross Unrealized (Losses)
Short-term Investments, Estimated Fair Value	5,499	962
U.S. treasury obligations [Member]
Gross unrealized gains and (losses) aggregated by investment category
Short-term Investments, Cost		29,393
Short-term Investments, Gross Unrealized Gains		11
Long-term investments, Cost	8,033
Long-term investments, Gross Unrealized Gains	2
Long-term Investments, Estimated Fair Value	8,035
U.S. agency obligations [Member]
Gross unrealized gains and (losses) aggregated by investment category
Short-term Investments, Cost	190,082	221,516
Short-term Investments, Gross Unrealized Gains	17	56
Short-term Investments, Gross Unrealized (Losses)	(46)	(7)
Long-term investments, Cost	9,532	7,876
Long-term investments, Gross Unrealized Gains	1
Long-term Investments, Gross Unrealized (Losses)		(3)
Long-term Investments, Estimated Fair Value	$ 9,533	$ 7,873

Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Reported as follows, Assets:
Long-term investments	$ 17,568	$ 7,873
Fair Value, Measurements, Recurring [Member]
Assets:
Cash and Cash Equivalents	207,884	137,976
Derivative assets:
Forward exchange contracts	444	531
Reported as follows, Assets:
Short-term investments	196,314	252,566
Other current assets	444	531
Total current assets	404,642	391,073
Long-term investments	17,568	7,873
Total assets	422,210	398,946
Liabilities:
Other current liabilities	827	1,054
Derivative liabilities:
Forward exchange contracts	827	1,054
Fair Value, Measurements, Recurring [Member] \| Money market funds [Member]
Assets:
Cash and Cash Equivalents	207,700	137,976
Fair Value, Measurements, Recurring [Member] \| Mutual funds [Member]
Trading securities:
Mutual funds	762	635
Fair Value, Measurements, Recurring [Member] \| Bankers' acceptance drafts [Member]
Assets:
Cash and Cash Equivalents	184
Available-for sale securities
Available-for-sale securities	5,499	962
Fair Value, Measurements, Recurring [Member] \| U.S. treasury obligations [Member]
Available-for sale securities
Available-for-sale securities	8,035	29,404
Fair Value, Measurements, Recurring [Member] \| U.S. agency obligations [Member]
Available-for sale securities
Available-for-sale securities	199,586	229,438
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Cash and Cash Equivalents	207,700	137,976
Reported as follows, Assets:
Short-term investments	166,574	140,308
Total current assets	374,274	278,284
Long-term investments	9,533	7,873
Total assets	383,807	286,157
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member] \| Money market funds [Member]
Assets:
Cash and Cash Equivalents	207,700	137,976
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member] \| Mutual funds [Member]
Trading securities:
Mutual funds	762	635
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member] \| U.S. agency obligations [Member]
Available-for sale securities
Available-for-sale securities	175,345	147,546
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Cash and Cash Equivalents	184
Derivative assets:
Forward exchange contracts	444	531
Reported as follows, Assets:
Short-term investments	29,740	112,258
Other current assets	444	531
Total current assets	30,368	112,789
Long-term investments	8,035
Total assets	38,403	112,789
Liabilities:
Other current liabilities	827	1,054
Derivative liabilities:
Forward exchange contracts	827	1,054
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| Bankers' acceptance drafts [Member]
Assets:
Cash and Cash Equivalents	184
Available-for sale securities
Available-for-sale securities	5,499	962
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| U.S. treasury obligations [Member]
Available-for sale securities
Available-for-sale securities	8,035	29,404
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| U.S. agency obligations [Member]
Available-for sale securities
Available-for-sale securities	24,241	81,892
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Cash and Cash Equivalents
Derivative assets:
Forward exchange contracts
Reported as follows, Assets:
Short-term investments
Other current assets
Total current assets
Long-term investments
Total assets
Liabilities:
Other current liabilities
Derivative liabilities:
Forward exchange contracts
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member] \| Money market funds [Member]
Assets:
Cash and Cash Equivalents
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member] \| Mutual funds [Member]
Trading securities:
Mutual funds
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member] \| Bankers' acceptance drafts [Member]
Assets:
Cash and Cash Equivalents
Available-for sale securities
Available-for-sale securities
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member] \| U.S. treasury obligations [Member]
Available-for sale securities
Available-for-sale securities
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member] \| U.S. agency obligations [Member]
Available-for sale securities
Available-for-sale securities

Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	$ 195,588	$ 251,968
Fair Value Measurements (Textual) [Abstract]
Cash not included in cash and cash equivalent amounts	167,364	146,035
Non-negotiable time Deposits	33,968	28,905
Time deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	$ 36	$ 37

- Definition

Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13, 17
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15C
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section A
-Paragraph 4, 5
-Chapter 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Derivatives (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Currency Hedged (Buy/Sell)
Currency Hedged (Buy/Sell), Gross Notional Value, Net	$ 51,575	$ 36,119
Currency Hedged (Buy/Sell), Fair Value, Net	(383)	(523)
U.S. Dollar/Japanese Yen [Member]
Currency Hedged (Buy/Sell)
Currency Hedged (Buy/Sell), Gross Notional Value, Net	23,848	18,676
Currency Hedged (Buy/Sell), Fair Value, Net	(107)	(961)
U.S. Dollar/South Korean Won [Member]
Currency Hedged (Buy/Sell)
Currency Hedged (Buy/Sell), Gross Notional Value, Net	19,893	10,799
Currency Hedged (Buy/Sell), Fair Value, Net	(471)	60
U.S. Dollar/Euro [Member]
Currency Hedged (Buy/Sell)
Currency Hedged (Buy/Sell), Gross Notional Value, Net	4,025	3,869
Currency Hedged (Buy/Sell), Fair Value, Net	181	288
U.S. Dollar/U.K. Pound Sterling [Member]
Currency Hedged (Buy/Sell)
Currency Hedged (Buy/Sell), Gross Notional Value, Net	3,809	2,775
Currency Hedged (Buy/Sell), Fair Value, Net	$ 14	$ 90

Derivatives (Details 1) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Derivative liabilities:
Total net derivative liability designated as hedging instruments	$ (383)	$ (523)
Designated as Hedging Instrument [Member]
Derivative assets:
Forward exchange contracts	444	531
Derivative liabilities:
Forward exchange contracts	(827)	(1,054)
Total net derivative liability designated as hedging instruments	$ (383)	$ (523)

Derivatives (Details 2) - Forward exchange contracts [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Derivatives Designated as Cash Flow Hedging Relationships
Net (loss) gain recognized in OCI	$ (1,065)	$ (157)	$ 398	$ (319)
Net gain (loss) reclassified from OCI into income	$ 74	$ (949)	$ (439)	$ (1,475)

Derivatives (Details Textual) - USD ($) $ in Thousands	6 Months Ended
Derivatives (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Derivatives (Textual) [Abstract]
Maximum period for hedging a portion of forecasted foreign currency denominated intercompany sales of inventory	18 months
Gross notional values of outstanding forward foreign exchange contracts	$ 51,575	$ 36,119
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset classified in other current assets	444	531
Derivative liability classified in other current liabilities	$ 827	$ 1,054

Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Inventories:
Raw materials	$ 80,239	$ 78,501
Work-in-process	20,409	21,298
Finished goods	44,961	53,833
Inventories	$ 145,609	$ 153,632

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2011	Jun. 30, 2012	Dec. 31, 2010
Goodwill
Goodwill gross carrying amount, Beginning balance	$ 279,434
Acquired goodwill	64
Goodwill gross carrying amount, Ending balance	279,498
Accumulated Impairment Loss, Beginning balance	(139,414)
Accumulated Impairment Loss, Ending balance	(139,414)
Goodwill, net	$ 140,084	$ 140,084	$ 140,020

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Goodwill and Intangible Assets (Details 1) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 110,948	$ 110,722
Accumulated Amortization	(109,917)	(109,679)
Intangible assets, net	1,031	1,043
Completed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	77,055	76,829
Accumulated Amortization	(76,853)	(76,829)
Intangible assets, net	202
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	9,190	9,190
Accumulated Amortization	(8,550)	(8,393)
Intangible assets, net	640	797
Patents, trademarks, trade names and other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	24,703	24,703
Accumulated Amortization	(24,514)	(24,457)
Intangible assets, net	$ 189	$ 246

Goodwill and Intangible Assets (Details 2) $ in Thousands	Jun. 30, 2012 USD ($)
Estimated amortization expense
2012 (remaining)	$ 238
2013	475
2014	97
2015	81
2016	81
2017	36
Thereafter	$ 23

Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Sep. 30, 2011
Goodwill and intangible assets (Textual) [Abstract]
Aggregate amortization expense related to acquired intangibles	$ 119		$ 250	$ 238	$ 500
Acquired intangible assets re-classified from other assets to intangible assets		$ 226
GE Osmonics [Member]
Business Acquisition [Line Items]
Purchased a product line from GE Osmonics						$ 458
Intangible asset in connection with acquisition						315
Goodwill in connection with acquisition						$ 64

Debt (Details) $ in Thousands	6 Months Ended
Debt (Details) $ in Thousands	Jun. 30, 2012 USD ($) Institution	Dec. 31, 2011 USD ($)
Debt (Textual) [Abstract]
Number of financial institutions that provide for aggregate borrowings \| Institution	2
Aggregate borrowing capacity	$ 31,462
Aggregate borrowings expire and renewed	3 month intervals
Total borrowings outstanding	$ 0	$ 1,932
Average interest rates on line of credit and short-term borrowing arrangement	0.65%

Product Warranties (Details) - USD ($) $ in Thousands	6 Months Ended
Product Warranties (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011
Product warranty activities
Beginning balance	$ 8,315	$ 9,865
Provision for product warranties	2,886	3,638
Direct charges to warranty liability	(2,475)	(3,832)
Ending balance	$ 8,726	$ 9,671

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Income Taxes (Textual) [Abstract]
Effective Tax Rate	33.70%	33.00%	32.90%	33.00%
Gross unrecognized tax benefits excluding interest and penalties	$ 37,505		$ 37,505		$ 35,151
Net unrecognized tax benefit that would impact the effective tax rate	16,864		16,864
Accrued interest on unrecognized tax benefits	$ 1,294		$ 1,294		$ 973

Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator:
Net income	$ 18,572	$ 38,601	$ 41,340	$ 76,644
Denominator:
Shares used in net income per common share - basic	52,679,000	52,346,000	52,591,000	51,877,000
Effect of dilutive securities:
Stock options, restricted stock and employee stock purchase plan	527,000	560,000	623,000	769,000
Shares used in net income per common share - diluted	53,206,000	52,906,000	53,214,000	52,646,000
Net income per common share:
Basic	$ 0.35	$ 0.74	$ 0.79	$ 1.48
Diluted	$ 0.35	$ 0.73	$ 0.78	$ 1.46
Net Income Per Share (Textual) [Abstract]
Stock options and restricted stock units	1,277,000	1,638,000	1,277,000	1,638,000
Number of shares excluded from computation of diluted earning per share	479,000	331,000	288,000	256,000

Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	Sep. 30, 2012	Mar. 31, 2012	Jun. 30, 2012	Jun. 30, 2011
Stockholders Equity (Textual) [Abstract]
Common stock, shares authorized to repurchase			$ 200,000
Stock repurchase, Shares			168,000
Value of shares repurchased			$ 4,960
Average price of repurchased shares			$ 29.52
Cash dividends to be paid	$ 0.16	$ 0.15	$ 0.30
Dividend payments to common stockholders			$ (15,806)	$ (15,628)

Business Segment, Geographic Area, Product and Significant Customer Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net revenues by reportable segment
Total net revenues	$ 177,397	$ 224,487	$ 368,265	$ 456,338
Advance Manufacturing Capital Equipment [Member]
Net revenues by reportable segment
Total net revenues	134,601	189,674	277,824	381,412
Analytical Solutions Group [Member]
Net revenues by reportable segment
Total net revenues	16,727	14,918	32,521	30,144
Europe Sales & Service Operations [Member]
Net revenues by reportable segment
Total net revenues	12,449	20,759	24,656	42,164
Asia Sales & Service Operations [Member]
Net revenues by reportable segment
Total net revenues	63,783	80,035	135,882	168,841
Corporate, Eliminations and Other [Member]
Net revenues by reportable segment
Total net revenues	$ (50,163)	$ (80,899)	$ (102,618)	$ (166,223)

Business Segment, Geographic Area, Product and Significant Customer Information (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Gross profit (loss) by reportable segment
Gross profit (loss)	$ 76,516	$ 104,988	$ 160,307	$ 211,349
Advance Manufacturing Capital Equipment [Member]
Gross profit (loss) by reportable segment
Gross profit (loss)	48,858	79,816	106,695	160,121
Analytical Solutions Group [Member]
Gross profit (loss) by reportable segment
Gross profit (loss)	8,284	7,511	16,384	15,247
Europe Sales & Service Operations [Member]
Gross profit (loss) by reportable segment
Gross profit (loss)	3,742	5,354	7,745	11,249
Asia Sales & Service Operations [Member]
Gross profit (loss) by reportable segment
Gross profit (loss)	11,851	11,513	19,113	24,248
Corporate, Eliminations and Other [Member]
Gross profit (loss) by reportable segment
Gross profit (loss)	$ 3,781	$ 794	$ 10,370	$ 484

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4K
-URI http://asc.fasb.org/extlink&oid=18733213&loc=SL4591552-111686

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=18733213&loc=SL4591551-111686

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A1, A4, A5
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Business Segment, Geographic Area, Product and Significant Customer Information (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Capital expenditures and segment assets by reportable segment
Capital expenditures	$ 3,445	$ 3,934	$ 8,012	$ 6,265
Segment assets:
Accounts receivable	104,827		104,827		$ 120,894
Inventories	145,609		145,609		153,632
Total Segment Assets	250,436		250,436		274,526
Advance Manufacturing Capital Equipment [Member]
Capital expenditures and segment assets by reportable segment
Capital expenditures	1,464	2,912	4,639	4,764
Segment assets:
Accounts receivable	13,333		13,333		24,224
Inventories	117,862		117,862		119,314
Total Segment Assets	131,195		131,195		143,538
Analytical Solutions Group [Member]
Capital expenditures and segment assets by reportable segment
Capital expenditures	300	136	415	220
Segment assets:
Accounts receivable	5,937		5,937		5,099
Inventories	4,479		4,479		4,442
Total Segment Assets	10,416		10,416		9,541
Europe Sales & Service Operations [Member]
Capital expenditures and segment assets by reportable segment
Capital expenditures	29	70	74	127
Segment assets:
Accounts receivable	6,437		6,437		6,079
Inventories	3,662		3,662		3,828
Total Segment Assets	10,099		10,099		9,907
Asia Sales & Service Operations [Member]
Capital expenditures and segment assets by reportable segment
Capital expenditures	124	389	417	476
Segment assets:
Accounts receivable	45,632		45,632		60,242
Inventories	33,552		33,552		45,828
Total Segment Assets	79,184		79,184		106,070
Corporate, Eliminations and Other [Member]
Capital expenditures and segment assets by reportable segment
Capital expenditures	1,528	$ 427	2,467	$ 678
Segment assets:
Accounts receivable	33,488		33,488		25,250
Inventories	(13,946)		(13,946)		(19,780)
Total Segment Assets	$ 19,542		$ 19,542		$ 5,470

Business Segment, Geographic Area, Product and Significant Customer Information (Details 3) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Reconciliation of segment assets to consolidated assets
Total segment assets	$ 250,436	$ 274,526
Cash and cash equivalents and investments	623,134	573,392
Other current assets	35,594	44,856
Property, plant and equipment, net	73,983	72,487
Goodwill and intangible assets, net	141,115	141,127
Other assets	10,658	12,266
Total assets	$ 1,134,920	$ 1,118,654

Business Segment, Geographic Area, Product and Significant Customer Information (Details 4) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net product and service revenues from product groups
Net sales from product groups	$ 177,397	$ 224,487	$ 368,265	$ 456,338
Instruments and Control Products [Member]
Net product and service revenues from product groups
Net sales from product groups	71,589	103,671	147,888	199,594
Power and Reactive Gas Products [Member]
Net product and service revenues from product groups
Net sales from product groups	70,267	83,523	147,833	180,005
Vacuum Products [Member]
Net product and service revenues from product groups
Net sales from product groups	17,695	21,411	37,723	44,644
Analytical Solutions Group Products [Member]
Net product and service revenues from product groups
Net sales from product groups	$ 17,846	$ 15,882	$ 34,821	$ 32,095

Business Segment, Geographic Area, Product and Significant Customer Information (Details 5) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Net revenues
Net revenues	$ 177,397	$ 224,487	$ 368,265	$ 456,338
Long-lived assets:
Long-lived assets	75,792		75,792		$ 74,479
United States [Member]
Net revenues
Net revenues	91,075	110,412	186,179	221,015
Long-lived assets:
Long-lived assets	59,022		59,022		56,760
Japan [Member]
Net revenues
Net revenues	19,419	27,551	52,852	52,190
Long-lived assets:
Long-lived assets	3,474		3,474		3,908
Europe [Member]
Net revenues
Net revenues	22,474	30,852	44,459	60,556
Long-lived assets:
Long-lived assets	5,369		5,369		5,437
Asia (excluding Japan) [Member]
Net revenues
Net revenues	44,429	$ 55,672	84,775	$ 122,577
Long-lived assets:
Long-lived assets	$ 7,927		$ 7,927		$ 8,374

Business Segment, Geographic Area, Product and Significant Customer Information (Details 6)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Customer A [Member]
Customers with net revenues greater than 10% of total net revenues
Percentage of total net revenues	14.90%	14.10%	14.70%	14.00%
Customer B [Member]
Customers with net revenues greater than 10% of total net revenues
Percentage of total net revenues	11.30%	9.20%	11.00%	9.50%

Business Segment, Geographic Area, Product and Significant Customer Information [Details Textual]	3 Months Ended	6 Months Ended
	Mar. 31, 2012 Segments	Jun. 30, 2012 Products Segments Customers
Geographic, Product and Significant Customer Information (Textual) [Abstract]
Number of operating and reporting segments	1
Number of major customers \| Customers		2
Entity wide net revenue major customer percentage minimum		10.00%
Number of reportable segments		4
Number of operating segments		8
Number of product groups \| Products		4

Label	Element	Value
Goodwill, Gross	us-gaap_GoodwillGross	$ 279,498,000
Goodwill, Impaired, Accumulated Impairment Loss	us-gaap_GoodwillImpairedAccumulatedImpairmentLoss	$ 139,414,000