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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2012	May 02, 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	Mar. 31, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		52,537,261

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 345,673	$ 312,916
Short-term investments	223,772	252,603
Trade accounts receivable, net	131,132	120,894
Inventories	148,474	153,632
Deferred income taxes	10,080	10,618
Other current assets	24,978	34,238
Total current assets	884,109	884,901
Property, plant and equipment, net	73,994	72,487
Long-term investments	16,481	7,873
Goodwill	140,084	140,084
Intangible assets, net	1,150	1,043
Other assets	11,915	12,266
Total assets	1,127,733	1,118,654
Current liabilities:
Short-term borrowings	368	1,932
Accounts payable	22,583	24,853
Accrued compensation	21,210	21,774
Income taxes payable	5,395	7,548
Other current liabilities	37,923	40,324
Total current liabilities	87,479	96,431
Other liabilities	34,212	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; 52,528,749 and 52,491,948 shares issued and outstanding at March 31, 2012 and December 31, 2011, respectively	113	113
Additional paid-in capital	709,707	707,419
Retained earnings	281,711	268,870
Accumulated other comprehensive income	14,511	13,610
Total stockholders' equity	1,006,042	990,012
Total liabilities and stockholders' equity	$ 1,127,733	$ 1,118,654

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 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	52,528,749	52,491,948
Common Stock, shares outstanding	52,528,749	52,491,948

Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net revenues:
Products	$ 164,488	$ 207,447
Services	26,380	24,404
Total net revenues	190,868	231,851
Cost of revenues:
Cost of products	91,024	111,215
Cost of services	16,053	14,275
Total cost of revenues	107,077	125,490
Gross profit	83,791	106,361
Research and development	16,184	16,896
Selling, general and administrative	34,119	32,707
Amortization of intangible assets	119	250
Income from operations	33,369	56,508
Interest income	261	276
Interest expense	9	5
Income before income taxes	33,621	56,779
Provision for income taxes	10,853	18,736
Net income	22,768	38,043
Other comprehensive income:
Changes in value of financial instruments designated as cash flow hedges, net of tax expense of $413 and $233 for the three months ended March 31, 2012 and 2011, respectively	641	394
Foreign currency translation adjustments, net of tax of $0 for the three months ended March 31, 2012 and 2011, respectively	301	3,124
Unrealized (loss) gain on investments, net of tax (benefit) expense of ($27) and $28 for the three months ended March 31, 2012 and 2011, respectively	(41)	48
Total comprehensive income	$ 23,669	$ 41,609
Net income per share:
Basic	$ 0.43	$ 0.74
Diluted	0.43	0.73
Cash dividends paid per common share	$ 0.15	$ 0.15
Weighted average common shares outstanding:
Basic	52,504	51,407
Diluted	53,222	52,386

Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements of Operations and Comprehensive Income [Abstract]
Tax expense on changes in value of financial instruments designated as cash flow hedges	$ 413	$ 233
Tax on foreign currency translation adjustments	0	0
Tax (benefit) expense on unrealized (loss) gain on investments	$ (27)	$ 28

- Definition

Change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity for the period being reported, net of tax. If an entity's functional currency is a foreign currency, translation adjustments result from the process of translating that entity's financial statements into the reporting currency. Includes gain (loss) on foreign currency forward exchange contracts. Includes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. Includes the gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) and that have been designated and have qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

+ References

+ Details

- Definition

Reclassification adjustment for unrealized gains or losses realized upon the sale of securities, after tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
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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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
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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 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
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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

- Definition

Net of tax effect of the reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 31, 46
-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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 18, 19
-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
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-Paragraph 38
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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

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income	$ 22,768	$ 38,043
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,143	3,177
Stock-based compensation	3,300	3,092
Provision for excess and obsolete inventory	4,263	3,066
Deferred income taxes	1,032	2,993
Excess tax benefits from stock-based compensation	(657)	(5,032)
Other	532	(289)
Changes in operating assets and liabilities:
Trade accounts receivable	(12,217)	(16,838)
Inventories	578	(5,984)
Income taxes	3,648	12,161
Other current assets	3,519	(1,048)
Accrued compensation and other liabilities	(187)	(4,847)
Accounts payable	(2,289)	(1,726)
Net cash provided by operating activities	27,433	26,768
Cash flows from investing activities:
Purchases of investments	(101,257)	(103,721)
Maturities and sales of investments	121,414	152,514
Purchases of property, plant and equipment	(4,567)	(2,331)
Other	(146)	(31)
Net cash provided by investing activities	15,444	46,431
Cash flows from financing activities:
Proceeds from short-term borrowings	2,896	2,988
Payments on short-term borrowings	(4,401)	(1,462)
Repurchase of common stock	(3,721)
Net proceeds related to employee stock awards	19	22,672
Dividend payment to common stockholders	(7,877)	(7,763)
Excess tax benefits from stock-based compensation	657	5,032
Net cash (used in) provided by financing activities	(12,427)	21,467
Effect of exchange rate changes on cash and cash equivalents	2,307	2,065
Increase in cash and cash equivalents	32,757	96,731
Cash and cash equivalents at beginning of period	312,916	162,476
Cash and cash equivalents at end of period	$ 345,673	$ 259,207

Basis of Presentation

3 Months Ended

Mar. 31, 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 March 31, 2012 and for the three months ended March 31, 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.

- Definition

Description of the basis of accounting used to prepare the financial statements (for example, U.S. Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). And describes an entity's accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. An entity also may describe its accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary. And provides an entity's explanation that the preparation of financial statements in conformity with generally accepted accounting principles requires the use of management estimates. Estimates used in the determination of carrying amounts of assets or liabilities, or in disclosure of gain or loss contingencies should be disclosed if known information available prior to issuance of the financial statements indicates that both of these criteria are met: (1) It is at least reasonably possible that the estimate of the effect on the financial statements of a condition, situation, or set of circumstances that existed at the date of the financial statements will change in the near term (less than one year from the date of issuance) due to one or more future confirming events, and (2) The effect of the change would be material to the financial statements. The disclosure should indicate the nature of the uncertainty and include an indication that it is at least reasonably possible that a change in the estimate will occur in the near term. Disclosure of the factors that cause the estimate to be sensitive to change also is encouraged. Entities also may identify those areas that are subject to significant estimates. And classifications in the current financial statements may be different from classifications in the prior year's financial statements. Disclose any material changes in classification including an explanation of the reason for the change and the areas impacted.

+ References + Details

Recently Issued Accounting Pronouncements

3 Months Ended

Mar. 31, 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. The 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. The new ASU did not have a material effect on the Company’s consolidated financial statements.

Investments

3 Months Ended

Mar. 31, 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:


	March 31, 2012		December 31, 2011
Available-for-sale investments:
Time deposits	$	38	$	37
Bankers acceptance drafts		364		962
U.S. treasury obligations		17,067		29,404
U.S. agency obligations		205,537		221,565

		223,006		251,968
Trading investments:
Mutual funds		766		635

	$	223,772	$	252,603

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


	March 31, 2012		December 31, 2011
U.S. agency obligations	$	16,481	$	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:


	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
As of March 31, 2012:
Short-term investments:
Time deposits	$	38	$	—	$	—		$	38
Bankers acceptance drafts		364		—		—			364
U.S. treasury obligations		17,065		2		—			17,067
U.S. agency obligations		205,544		34		(41	)		205,537

	$	223,011	$	36	$	(41	)	$	223,006
Long-term investments:
U.S. agency obligations	$	16,477	$	4	$	—		$	16,481


	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
As of December 31, 2011:
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 and realized gains or losses are reflected in income and were not material for the three months ended March 31, 2012 and 2011, respectively.

The unrealized gains and losses for trading investments were immaterial for the three months ended March 31, 2012. The Company did not have trading securities as of March 31, 2011.

- Definition

Tabular disclosure of investments in certain debt and equity securities (and certain other trading assets) which include all debt and equity securities (other than those equity securities accounted for under the equity or cost methods of accounting) with readily determinable fair values. Other trading assets include assets that are carried on the balance sheet at fair value and held for trading purposes. A debt security represents a creditor relationship with an enterprise that is in the form of a security. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities (and other trading assets).

+ References

Reference 1: 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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6511694
-Topic 320

+ Details

Fair Value Measurements

3 Months Ended

Mar. 31, 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. Our 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 measured at fair value on a recurring basis as of March 31, 2012, are summarized as follows:


			Fair Value Measurements at Reporting Date Using
Description	March 31, 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	$	131,668	$	131,668	$	—	$	—
Trading securities:
Mutual funds		766		766		—		—
Available-for-sale securities:
Bankers acceptance drafts		364		—		364		—
U.S. treasury obligations		17,067		—		17,067		—
U.S. agency obligations		222,018		175,768		46,250		—
Derivatives – currency forward contracts		981		—		981		—

Total assets	$	372,864	$	308,202	$	64,662	$	—
Liabilities:
Derivatives – currency forward contracts	$	449	$	—	$	449	$	—


Reported as follows:
Assets:
Cash and cash equivalents (1)	$	131,668	$	131,668	$	—	$	—
Short-term investments (2)		223,734		165,059		58,675		—
Other current assets		981		—		981		—

Total current assets	$	356,383	$	296,727	$	59,656	$	—

Long-term investments	$	16,481	$	11,475	$	5,006	$	—

Liabilities:
Other current liabilities	$	449	$	—	$	449	$	—

(1)	The cash and cash equivalent amounts presented in the table above do not include cash of $177,615 and non-negotiable time deposits of $36,390 as of March 31, 2012.

(2)	The short-term investments presented in the table above do not include non-negotiable time deposits of $38 as of March 31, 2012.


			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 March 31, 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.

Available-For-Sale Investments

As of March 31, 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 Statement of Financial Accounting Standard (FAS)
-Number 133
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-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 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 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 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-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 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Topic 820
-SubTopic 10
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Derivatives

3 Months Ended

Mar. 31, 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 March 31, 2012 and December 31, 2011, the Company had outstanding forward foreign exchange contracts with gross notional values of $38,612 and $36,119, respectively. The following tables provide a summary of the primary net hedging positions and corresponding fair values held as of March 31, 2012 and December 31, 2011:


	March 31, 2012
Currency Hedged (Buy/Sell)	Gross Notional Value		Fair Value (1)
U.S. Dollar/Japanese Yen	$	17,754	$	859
U.S. Dollar/South Korean Won		14,701		(335	)
U.S. Dollar/Euro		3,457		46
U.S. Dollar/U.K. Pound Sterling		2,700		(38	)

Total	$	38,612	$	532


	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	March 31, 2012			December 31, 2011
Derivative assets:
Forward exchange contracts	$	981		$	531
Derivative liabilities:
Forward exchange contracts		(449	)		(1,054	)

Total net derivative asset (liability) designated as hedging instruments (1)	$	532		$	(523	)

(1)

The derivative asset of $981 and derivative liability of $449 are classified in other current assets and other current liabilities, respectively, in the consolidated balance sheet as of March 31, 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:


Derivatives Designated as Cash Flow Hedging Relationships	Three Months Ended March 31,
	2012			2011
Forward exchange contracts:
Net gain (loss) recognized in OCI (1)	$	1,334		$	(162	)
Net loss reclassified from OCI into income (2)		(513	)		(526	)

(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

Reference 1: 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 2: 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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Inventories

3 Months Ended

Mar. 31, 2012

Inventories [Abstract]

Inventories

6)	Inventories

Inventories consist of the following:


	March 31, 2012		December 31, 2011
Raw material	$	80,762	$	78,501
Work-in-process		20,106		21,298
Finished goods		47,606		53,833

	$	148,474	$	153,632

Goodwill and Intangible Assets

3 Months Ended

Mar. 31, 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 three months ended March 31, 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 March 31, 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:


	Gross		Accumulated Amortization			Net
As of March 31, 2012:
Completed technology (1)	$	77,055	$	(76,842	)	$	213
Customer relationships		9,190		(8,471	)		719
Patents, trademarks, trade names and other		24,703		(24,485	)		218

	$	110,948	$	(109,798	)	$	1,150


	Gross		Accumulated Amortization			Net
As of December 31, 2011:
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 months ended March 31, 2012 and 2011 were $119 and $250, respectively. Estimated amortization expense for each of the three remaining fiscal years is as follows:


Year	Amount
2012 (remaining)	$	356
2013		475
2014		97
2015		81
2016		81
Thereafter		60

- 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

3 Months Ended

Mar. 31, 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 March 31, 2012 of up to an equivalent of $30,193 U.S. dollars, which generally expire and are renewed at three month intervals. At March 31, 2012 and December 31, 2011 total borrowings outstanding under these arrangements were $368 and $1,932, respectively, at an average interest rate of 0.65%.

- 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

3 Months Ended

Mar. 31, 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:


	Three Months Ended March 31,
	2012			2011
Balance at January 1	$	8,315		$	9,865
Provision for product warranties		692			1,986
Direct charges to warranty liability		(1,462	)		(1,898	)

Balance at March 31	$	7,545		$	9,953

Income Taxes

3 Months Ended

Mar. 31, 2012

Income Taxes [Abstract]

Income Taxes

10)	Income Taxes

The Company’s effective tax rate for the three months ended March 31, 2012 and 2011 was 32.3% and 33.0%, respectively. The effective tax rates for the three months ended March 31, 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 March 31, 2012, the total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $35,915. 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 $16,151, excluding interest and penalties, would impact the Company’s effective tax rate as of March 31, 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 March 31, 2012 and December 31, 2011, the Company had accrued interest on unrecognized tax benefits of approximately $1,145 and $973, respectively.

The Company and its subsidiaries are subject to examination by federal, state and foreign tax authorities. Subsequent to the close of the quarter ended March 31, 2012, the Company was notified by the Internal Revenue Service that an examination of its U.S. federal tax filings for open tax years through 2009 will commence during the second quarter of 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 could 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-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 Accounting Standards Codification
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-Section 50
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 6: 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.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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-Topic 740
-SubTopic 10
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

Net Income Per Share

3 Months Ended

Mar. 31, 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 March 31,
	2012		2011
Numerator:
Net income	$	22,768	$	38,043

Denominator:
Shares used in net income per common share – basic		52,504,000		51,407,000
Effect of dilutive securities:
Stock options, restricted stock and employee stock purchase plan		718,000		979,000

Shares used in net income per common share – diluted		53,222,000		52,386,000


Basic income per common share	$	0.43	$	0.74
Diluted income per common share	$	0.43	$	0.73

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 March 31, 2012 and 2011, stock options and restricted stock units relating to an aggregate of approximately 1,477,000 and 1,505,000 shares, respectively, were outstanding. For the three months ended March 31, 2012 and 2011, the potential dilutive effect of approximately 97,000 and 180,000 weighted-average shares of 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

3 Months Ended

Mar. 31, 2012

Stockholder's Equity [Abstract]

Stockholder's Equity

12)	Stockholder’s Equity

Stock Repurchase Program

On July 25, 2011, the Company’s 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 three months ended March 31, 2012, the Company repurchased 124,000 shares of its common stock for $3,721 for an average price of $30.01 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. On February 13, 2012, the Company’s Board of Directors declared a quarterly cash dividend of $0.15 per share that was paid on March 16, 2012 to shareholders of record as of March 1, 2012. Cash dividends paid were $7,877 for the quarter ended March 31, 2012.

On May 7, 2012, our Board of Directors declared a quarterly cash dividend of $0.15 per share to be paid on June 15, 2012 to shareholders of record as of June 1, 2012. Future dividend declarations, if any, as well as the record and payment dates for such dividends, are subject to the final determination of the Company’s Board of Directors.

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph d

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 7, 11A
-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 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 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 7: 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 8: 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 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 11: 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 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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Reference 20: http://www.xbrl.org/2003/role/presentationRef
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-Topic 310
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Reference 21: 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 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770

+ Details

Geographic, Product and Significant Customer Information

3 Months Ended

Mar. 31, 2012

Geographic, Product and Significant Customer Information [Abstract]

Geographic, Product and Significant Customer Information

13)	Geographic, Product and Significant Customer Information

The Company operates in one segment for the development, manufacturing, sales and servicing of products that measure, control, power and monitor critical parameters of advanced manufacturing processes. The Company’s chief decision-maker reviews consolidated operating results to make decisions about allocating resources and assessing performance for the entire Company.

Information about the Company’s operations in different geographic regions is presented in the tables below. Net revenues 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 revenues.


	Three Months Ended March 31,
	2012		2011
Geographic net revenues:
United States	$	95,104	$	110,603
Japan		33,433		24,639
Europe		21,985		29,704
Asia (excluding Japan)		40,346		66,905

	$	190,868	$	231,851


	March 31, 2012		December 31, 2011
Long-lived assets (1):
United States	$	58,482	$	56,760
Japan		3,515		3,908
Europe		5,606		5,437
Asia (excluding Japan)		8,271		8,374

	$	75,874	$	74,479

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

The Company reports revenues and groups products into three product groups, based upon the similarity of the product function, type of product, and manufacturing process. Net product and service revenues for these product groups are as follows:


	Three Months Ended March 31,
	2012		2011
Instruments and Control Systems	$	93,274	$	112,136
Power and Reactive Gas Products		77,566		96,482
Vacuum Products		20,028		23,233

	$	190,868	$	231,851

- 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 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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Commitments and Contingencies

3 Months Ended

Mar. 31, 2012

Commitments and Contingencies/Product Warranties [Abstract]

Commitments and Contingencies

14)	Commitments and Contingencies

The Company is subject to various other 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 March 31, 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.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-SubTopic 20
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

+ Details

Investments (Tables)

3 Months Ended

Mar. 31, 2012

Investments [Abstract]

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

<table cellspacing="0" cellpadding="0" width="76%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="68%"> </td> <td valign="bottom" width="9%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="9%"> </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">March 31, 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">$</td> <td valign="bottom" align="right">38</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</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">364</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">17,067</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">205,537</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">223,006</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 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">766</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">$</td> <td valign="bottom" align="right">223,772</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</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


	March 31, 2012		December 31, 2011
U.S. agency obligations	$	16,481	$	7,873

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


	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
As of March 31, 2012:
Short-term investments:
Time deposits	$	38	$	—	$	—		$	38
Bankers acceptance drafts		364		—		—			364
U.S. treasury obligations		17,065		2		—			17,067
U.S. agency obligations		205,544		34		(41	)		205,537

	$	223,011	$	36	$	(41	)	$	223,006
Long-term investments:
U.S. agency obligations	$	16,477	$	4	$	—		$	16,481


	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
As of December 31, 2011:
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 consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-1
-Paragraph 21
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 17
-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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 19, 20, 21
-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 Accounting Standards Codification
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-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

+ Details

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Measurements [Abstract]

Schedule of fair value assets and liabilities measured on recurring basis


			Fair Value Measurements at Reporting Date Using
Description	March 31, 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	$	131,668	$	131,668	$	—	$	—
Trading securities:
Mutual funds		766		766		—		—
Available-for-sale securities:
Bankers acceptance drafts		364		—		364		—
U.S. treasury obligations		17,067		—		17,067		—
U.S. agency obligations		222,018		175,768		46,250		—
Derivatives – currency forward contracts		981		—		981		—

Total assets	$	372,864	$	308,202	$	64,662	$	—
Liabilities:
Derivatives – currency forward contracts	$	449	$	—	$	449	$	—


Reported as follows:
Assets:
Cash and cash equivalents (1)	$	131,668	$	131,668	$	—	$	—
Short-term investments (2)		223,734		165,059		58,675		—
Other current assets		981		—		981		—

Total current assets	$	356,383	$	296,727	$	59,656	$	—

Long-term investments	$	16,481	$	11,475	$	5,006	$	—

Liabilities:
Other current liabilities	$	449	$	—	$	449	$	—

(1)	The cash and cash equivalent amounts presented in the table above do not include cash of $177,615 and non-negotiable time deposits of $36,390 as of March 31, 2012.

(2)	The short-term investments presented in the table above do not include non-negotiable time deposits of $38 as of March 31, 2012.


			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)

3 Months Ended

Mar. 31, 2012

Derivatives [Abstract]

Summary of the primary net hedging positions and corresponding fair values


	March 31, 2012
Currency Hedged (Buy/Sell)	Gross Notional Value		Fair Value (1)
U.S. Dollar/Japanese Yen	$	17,754	$	859
U.S. Dollar/South Korean Won		14,701		(335	)
U.S. Dollar/Euro		3,457		46
U.S. Dollar/U.K. Pound Sterling		2,700		(38	)

Total	$	38,612	$	532


	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	March 31, 2012			December 31, 2011
Derivative assets:
Forward exchange contracts	$	981		$	531
Derivative liabilities:
Forward exchange contracts		(449	)		(1,054	)

Total net derivative asset (liability) designated as hedging instruments (1)	$	532		$	(523	)

(1)

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


Derivatives Designated as Cash Flow Hedging Relationships	Three Months Ended March 31,
	2012			2011
Forward exchange contracts:
Net gain (loss) recognized in OCI (1)	$	1,334		$	(162	)
Net loss reclassified from OCI into income (2)		(513	)		(526	)

(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 1A
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959

Reference 2: 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=6935481&loc=SL5624163-113959

Reference 3: 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=6935481&loc=SL5624171-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41678-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(2))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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-Publisher FASB
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-Topic 815
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

+ Details

Inventories (Tables)

3 Months Ended

Mar. 31, 2012

Inventories [Abstract]

Inventories


	March 31, 2012		December 31, 2011
Raw material	$	80,762	$	78,501
Work-in-process		20,106		21,298
Finished goods		47,606		53,833

	$	148,474	$	153,632

Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 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 March 31, 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


	Gross		Accumulated Amortization			Net
As of March 31, 2012:
Completed technology (1)	$	77,055	$	(76,842	)	$	213
Customer relationships		9,190		(8,471	)		719
Patents, trademarks, trade names and other		24,703		(24,485	)		218

	$	110,948	$	(109,798	)	$	1,150


	Gross		Accumulated Amortization			Net
As of December 31, 2011:
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)	$	356
2013		475
2014		97
2015		81
2016		81
Thereafter		60

- Definition

Tabular disclosure of goodwill by reportable segment and in total. Disclosure details may include, but are not limited to, the carrying amount of goodwill, goodwill acquired during the year, goodwill impairment losses recognized, goodwill written-off due to the sale of a business unit, goodwill not yet allocated, and any other changes to goodwill.

+ References + Details

Product Warranties (Tables)

3 Months Ended

Mar. 31, 2012

Commitments and Contingencies/Product Warranties [Abstract]

Product warranty activities


	Three Months Ended March 31,
	2012			2011
Balance at January 1	$	8,315		$	9,865
Provision for product warranties		692			1,986
Direct charges to warranty liability		(1,462	)		(1,898	)

Balance at March 31	$	7,545		$	9,953

Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2012

Net Income Per Share [Abstract]

Computation of basic and diluted net income per share


	Three Months Ended March 31,
	2012		2011
Numerator:
Net income	$	22,768	$	38,043

Denominator:
Shares used in net income per common share – basic		52,504,000		51,407,000
Effect of dilutive securities:
Stock options, restricted stock and employee stock purchase plan		718,000		979,000

Shares used in net income per common share – diluted		53,222,000		52,386,000


Basic income per common share	$	0.43	$	0.74
Diluted income per common share	$	0.43	$	0.73

Geographic, Product and Significant Customer Information (Tables)

3 Months Ended

Mar. 31, 2012

Geographic, Product and Significant Customer Information [Abstract]

Company's operations in different geographic regions


	Three Months Ended March 31,
	2012		2011
Geographic net revenues:
United States	$	95,104	$	110,603
Japan		33,433		24,639
Europe		21,985		29,704
Asia (excluding Japan)		40,346		66,905

	$	190,868	$	231,851


	March 31, 2012		December 31, 2011
Long-lived assets (1):
United States	$	58,482	$	56,760
Japan		3,515		3,908
Europe		5,606		5,437
Asia (excluding Japan)		8,271		8,374

	$	75,874	$	74,479

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

Net product and service revenues from product groups


	Three Months Ended March 31,
	2012		2011
Instruments and Control Systems	$	93,274	$	112,136
Power and Reactive Gas Products		77,566		96,482
Vacuum Products		20,028		23,233

	$	190,868	$	231,851

Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Available-for-sale investments:
Fair value of short-term available-for-sale investments	$ 223,006	$ 251,968
Short-term investments:
Fair value of short-term investments	223,772	252,603
Fair value of long-term available-for-sale investments
Fair value of long-term available-for-sale investments, U.S. agency obligations	16,481	7,873
Time deposits [Member]
Available-for-sale investments:
Fair value of short-term available-for-sale investments	38	37
Bankers acceptance drafts [Member]
Available-for-sale investments:
Fair value of short-term available-for-sale investments	364	962
U.S. treasury obligations [Member]
Available-for-sale investments:
Fair value of short-term available-for sale	17,067	29,404
U.S. agency obligations [Member]
Available-for-sale investments:
Fair value of short-term available-for sale	205,537	221,565
Fair value of long-term available-for-sale investments
Fair value of long-term available-for-sale investments, U.S. agency obligations	16,481	7,873
Mutual funds [Member]
Short-term investments:
Fair value of short-term investments, mutual funds	$ 766	$ 635

Investments (Details 1) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Gross unrealized gains and (losses) aggregated by investment category
Short-term Investments, Cost	$ 223,011	$ 251,908
Short-term Investments, Gross Unrealized Gains	36	67
Short-term Investments, Gross Unrealized (Losses)	(41)	(7)
Short-term Investments, Estimated Fair Value	223,006	251,968
Fair value of long-term available-for-sale investments, U.S. agency obligations	16,481	7,873
Time deposits [Member]
Gross unrealized gains and (losses) aggregated by investment category
Short-term Investments, Cost	38	37
Short-term Investments, Gross Unrealized Gains	0	0
Short-term Investments, Gross Unrealized (Losses)	0	0
Short-term Investments, Estimated Fair Value	38	37
Bankers acceptance drafts [Member]
Gross unrealized gains and (losses) aggregated by investment category
Short-term Investments, Cost	364	962
Short-term Investments, Gross Unrealized Gains	0	0
Short-term Investments, Gross Unrealized (Losses)	0	0
Short-term Investments, Estimated Fair Value	364	962
U.S. treasury obligations [Member]
Gross unrealized gains and (losses) aggregated by investment category
Short-term Investments, Cost	17,065	29,393
Short-term Investments, Gross Unrealized Gains	2	11
Short-term Investments, Gross Unrealized (Losses)	0	0
Short-term Investments, Estimated Fair Value	17,067	29,404
U.S. agency obligations [Member]
Gross unrealized gains and (losses) aggregated by investment category
Short-term Investments, Cost	205,544	221,516
Short-term Investments, Gross Unrealized Gains	34	56
Short-term Investments, Gross Unrealized (Losses)	(41)	(7)
Short-term Investments, Estimated Fair Value	205,537	221,565
Long-term investments, Cost	16,477	7,876
Long-term investments, Gross Unrealized Gains	4	0
Long-term Investments, Gross Unrealized (Losses)	0	(3)
Fair value of long-term available-for-sale investments, U.S. agency obligations	$ 16,481	$ 7,873

Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Available-for sale securities
Long-term investments	$ 16,481	$ 7,873
Fair Value, Measurements, Recurring [Member]
Assets:
Cash and Cash Equivalents	131,668	137,976
Available-for sale securities
Derivatives - currency forward contracts	981	531
Short-term investments (2)	223,734	252,566
Other current assets	981	531
Total current assets	356,383	391,073
Long-term investments	16,481	7,873
Total assets	372,864	398,946
Liabilities:
Other current liabilities	449	1,054
Derivatives - currency forward contracts	449	1,054
Fair Value, Measurements, Recurring [Member] \| Money market funds [Member]
Assets:
Cash and Cash Equivalents	131,668	137,976
Fair Value, Measurements, Recurring [Member] \| Mutual funds [Member]
Trading securities:
Mutual funds	766	635
Fair Value, Measurements, Recurring [Member] \| Bankers acceptance drafts [Member]
Available-for sale securities
Available-for-sale securities	364	962
Fair Value, Measurements, Recurring [Member] \| U.S. treasury obligations [Member]
Available-for sale securities
Available-for-sale securities	17,067	29,404
Fair Value, Measurements, Recurring [Member] \| U.S. agency obligations [Member]
Available-for sale securities
Available-for-sale securities	222,018	229,438
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Cash and Cash Equivalents	131,668	137,976
Available-for sale securities
Derivatives - currency forward contracts	0	0
Short-term investments (2)	165,059	140,308
Other current assets	0	0
Total current assets	296,727	278,284
Long-term investments	11,475	7,873
Total assets	308,202	286,157
Liabilities:
Other current liabilities	0	0
Derivatives - currency forward contracts	0	0
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	131,668	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	766	635
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member] \| Bankers acceptance drafts [Member]
Available-for sale securities
Available-for-sale securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member] \| U.S. treasury obligations [Member]
Available-for sale securities
Available-for-sale securities	0	0
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	175,768	147,546
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Cash and Cash Equivalents	0	0
Available-for sale securities
Derivatives - currency forward contracts	981	531
Short-term investments (2)	58,675	112,258
Other current assets	981	531
Total current assets	59,656	112,789
Long-term investments	5,006	0
Total assets	64,662	112,789
Liabilities:
Other current liabilities	449	1,054
Derivatives - currency forward contracts	449	1,054
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| Money market funds [Member]
Assets:
Cash and Cash Equivalents	0	0
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| Mutual funds [Member]
Trading securities:
Mutual funds	0	0
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| Bankers acceptance drafts [Member]
Available-for sale securities
Available-for-sale securities	364	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	17,067	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	46,250	81,892
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Cash and Cash Equivalents
Available-for sale securities
Derivatives - currency forward contracts
Short-term investments (2)
Other current assets
Total current assets
Long-term investments
Total assets
Liabilities:
Other current liabilities
Derivatives - currency forward 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]
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	Mar. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	$ 223,006	$ 251,968
Fair Value Measurements (Textual) [Abstract]
Cash	177,615	146,035
Non-negotiable time Deposits	36,390	28,905
Time deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	$ 38	$ 37

- Definition

Investments in debt and equity securities which are categorized neither as trading securities nor held-to-maturity securities and which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

+ References

Reference 1: 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 2: 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 3: 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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 3
-Section A
-Paragraph 4, 5
-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 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 6: 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=6379932&loc=d3e22054-111558

Reference 7: 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 8: 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 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	Mar. 31, 2012	Dec. 31, 2011
Currency Hedged (Buy/Sell)
Currency Hedged (Buy/Sell), Gross Notional Value, Net	$ 38,612	$ 36,119
Currency Hedged (Buy/Sell), Fair Value, Net	532	(523)
U.S. Dollar/Japanese Yen [Member]
Currency Hedged (Buy/Sell)
Currency Hedged (Buy/Sell), Gross Notional Value, Net	17,754	18,676
Currency Hedged (Buy/Sell), Fair Value, Net	859	(961)
U.S. Dollar/South Korean Won [Member]
Currency Hedged (Buy/Sell)
Currency Hedged (Buy/Sell), Gross Notional Value, Net	14,701	10,799
Currency Hedged (Buy/Sell), Fair Value, Net	(335)	60
U.S. Dollar/Euro [Member]
Currency Hedged (Buy/Sell)
Currency Hedged (Buy/Sell), Gross Notional Value, Net	3,457	3,869
Currency Hedged (Buy/Sell), Fair Value, Net	46	288
U.S. Dollar/U.K. Pound Sterling [Member]
Currency Hedged (Buy/Sell)
Currency Hedged (Buy/Sell), Gross Notional Value, Net	2,700	2,775
Currency Hedged (Buy/Sell), Fair Value, Net	$ (38)	$ 90

Derivatives (Details 1) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Derivative liabilities:
Total net derivative asset (liability) designated as hedging instruments	$ 532	$ (523)
Designated as Hedging Instrument [Member]
Derivative assets:
Derivative assets	981	531
Derivative liabilities:
Derivative liabilities	(449)	(1,054)
Total net derivative asset (liability) designated as hedging instruments	$ 532	$ (523)

Derivatives (Details 2) - Forward exchange contracts [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivatives Designated as Cash Flow Hedging Relationships
Net (loss) gain recognized in OCI	$ 1,334	$ (162)
Net loss reclassified from OCI into income	$ (513)	$ (526)

Derivatives (Details Textual) - USD ($) $ in Thousands	Mar. 31, 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	$ 38,612	$ 36,119
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset classified in other current assets	981	531
Derivative liability classified in other current liabilities	$ 449	$ 1,054

Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Inventories:
Raw materials	$ 80,762	$ 78,501
Work-in-process	20,106	21,298
Finished goods	47,606	53,833
Inventories	$ 148,474	$ 153,632

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill
Goodwill gross carrying amount, Beginning balance	$ 279,498	$ 279,434
Acquired goodwill	0	64
Goodwill gross carrying amount, Ending balance	279,498	279,498
Accumulated Impairment Loss, Beginning balance	(139,414)	(139,414)
Sale of discontinued operations, accumulated impairment loss
Accumulated Impairment Loss, Ending balance	(139,414)	(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 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 2: 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 3: 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 4: 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 5: 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=6905597&loc=d3e13816-109267

Reference 6: 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 7: 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 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	Mar. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 110,948	$ 110,722
Accumulated Amortization	(109,798)	(109,679)
Intangible assets, net	1,150	1,043
Completed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	77,055	76,829
Accumulated Amortization	(76,842)	(76,829)
Intangible assets, net	213	0
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	9,190	9,190
Accumulated Amortization	(8,471)	(8,393)
Intangible assets, net	719	797
Patents, trademarks, trade names and other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	24,703	24,703
Accumulated Amortization	(24,485)	(24,457)
Intangible assets, net	$ 218	$ 246

Goodwill and Intangible Assets (Details 2) $ in Thousands	3 Months Ended
Goodwill and Intangible Assets (Details 2) $ in Thousands	Mar. 31, 2012 USD ($)
Estimated amortization expense
2012 (remaining)	$ 356
2013	475
2014	97
2015	81
2016	81
Thereafter	$ 60

Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Sep. 30, 2011
Goodwill and intangible assets (Textual) [Abstract]
Aggregate amortization expense related to acquired intangibles	$ 119	$ 250
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	3 Months Ended	12 Months Ended
Debt (Details) $ in Thousands	Mar. 31, 2012 USD ($) Institution	Dec. 31, 2011 USD ($)
Debt (Textual) [Abstract]
Number of financial institutions that provide for aggregate borrowings \| Institution	2
Aggregate borrowing capacity	$ 30,193
Aggregate borrowings expire and renewed	3 month intervals
Total borrowings outstanding	$ 368	$ 1,932
Average interest rates on line of credit and short-term borrowing arrangement	0.65%	0.65%

Product Warranties (Details) - USD ($) $ in Thousands	3 Months Ended
Product Warranties (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Mar. 31, 2011
Product warranty activities
Beginning balance	$ 8,315	$ 9,865
Provision for product warranties	692	1,986
Direct charges to warranty liability	(1,462)	(1,898)
Ending balance	$ 7,545	$ 9,953

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Income Taxes (Textual) [Abstract]
Effective Tax Rate	32.30%	33.00%
Gross unrecognized tax benefits excluding interest and penalties	$ 35,915		$ 35,151
Net unrecognized tax benefit that would impact the effective tax rate	16,151
Accrued interest on unrecognized tax benefits	$ 1,145		$ 973

Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Numerator:
Net income	$ 22,768	$ 38,043
Denominator:
Shares used in net income per common share - basic	52,504,000	51,407,000
Effect of dilutive securities:
Stock options, restricted stock and employee stock purchase plan	718,000	979,000
Shares used in net income per common share - diluted	53,222,000	52,386,000
Basic income per common share	$ 0.43	$ 0.74
Diluted income per common share	$ 0.43	$ 0.73
Net Income Per Share (Textual) [Abstract]
Stock options and restricted stock units	1,477,000	1,505,000
Number of shares excluded from computation of diluted earning per share	97,000	180,000

Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	May 31, 2012	Mar. 31, 2012	Mar. 31, 2011
Stockholders Equity (Textual) [Abstract]
Common stock, shares authorized to repurchase		$ 200,000
Stock repurchase, Shares		124,000
Value of shares repurchased		$ 3,721
Average price of repurchased shares		$ 30.01
Dividends payable amounts per share	$ 0.15	$ 0.15
Total cash dividend paid		$ 7,877	$ 7,763

Geographic, Product and Significant Customer Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Geographic net revenues:
Geographic net revenues	$ 190,868	$ 231,851
Long-lived assets:
Long-lived assets	75,874		$ 74,479
Unites States [Member]
Geographic net revenues:
Geographic net revenues	95,104	110,603
Long-lived assets:
Long-lived assets	58,482		56,760
Japan [Member]
Geographic net revenues:
Geographic net revenues	33,433	24,639
Long-lived assets:
Long-lived assets	3,515		3,908
Europe [Member]
Geographic net revenues:
Geographic net revenues	21,985	29,704
Long-lived assets:
Long-lived assets	5,606		5,437
Asia (excluding Japan) [Member]
Geographic net revenues:
Geographic net revenues	40,346	$ 66,905
Long-lived assets:
Long-lived assets	$ 8,271		$ 8,374

Geographic, Product and Significant Customer Information (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net product and service revenues from product groups
Net sales from product groups	$ 190,868	$ 231,851
Instruments and Control Systems [Member]
Net product and service revenues from product groups
Net sales from product groups	93,274	112,136
Power and Reactive Gas Products [Member]
Net product and service revenues from product groups
Net sales from product groups	77,566	96,482
Vacuum Products [Member]
Net product and service revenues from product groups
Net sales from product groups	$ 20,028	$ 23,233

Geographic, Product and Significant Customer Information (Details Textual)	3 Months Ended
	Mar. 31, 2012 Product Segment
Geographic, Product and Significant Customer Information (Textual) [Abstract]
Number of product groups \| Product	3
Number of operating segments \| Segment	1