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Document and Entity Information - USD ($)	6 Months Ended
Document and Entity Information - USD ($)	Jun. 30, 2011	Jul. 29, 2011	Jun. 30, 2010
Document and Entity Information [Abstract]
Entity Registrant Name	MKS INSTRUMENTS INC
Entity Central Index Key	0001049502
Document Type	10-Q
Document Period End Date	Jun. 30, 2011
Amendment Flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 938,960,587
Entity Common Stock, Shares Outstanding		52,460,897

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 226,538	$ 162,476
Short-term investments	269,749	269,457
Trade accounts receivable, net	150,980	138,181
Inventories	164,450	156,429
Deferred income taxes	13,872	13,775
Other current assets	24,120	12,577
Total current assets	849,709	752,895
Property, plant and equipment, net	69,653	68,976
Long-term marketable securities	5,277	0
Goodwill	140,020	140,020
Intangible assets, net	1,243	1,743
Other assets	14,713	18,779
Total assets	1,080,615	982,413
Current liabilities:
Short-term borrowings	619	0
Accounts payable	33,754	36,427
Accrued compensation	29,201	29,944
Income taxes payable	490	5,347
Other current liabilities	37,919	37,968
Total current liabilities	101,983	109,686
Other liabilities	29,666	25,688
Commitments and contingencies (Note 15)
Stockholders' equity:
Preferred Stock, $0.01 par value, 2,000,000 shares authorized; none issued and outstanding	0	0
Common Stock, no par value, 200,000,000 shares authorized; 52,439,231 and 50,648,601 shares issued and outstanding at June 30, 2011 and December 31, 2010, respectively	113	113
Additional paid-in capital	699,458	663,792
Retained earnings	232,372	171,356
Accumulated other comprehensive income	17,023	11,778
Total stockholders' equity	948,966	847,039
Total liabilities and stockholders' equity	$ 1,080,615	$ 982,413

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2011	Dec. 31, 2010
Stockholders' equity:
Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock, shares authorized	2,000,000	2,000,000
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Common Stock, par value	$ 0	$ 0
Common Stock, shares authorized	200,000,000	200,000,000
Common Stock, shares issued	52,439,231	50,648,601
Common Stock, shares outstanding	52,439,231	50,648,601

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net revenues
Products	$ 198,737	$ 198,930	$ 406,184	$ 370,001
Services	25,750	21,717	50,154	42,812
Total net revenues	224,487	220,647	456,338	412,813
Cost of revenues
Cost of products	105,086	111,117	216,301	205,256
Cost of services	14,413	12,211	28,688	24,743
Total cost of revenues	119,499	123,328	244,989	229,999
Gross profit	104,988	97,319	211,349	182,814
Research and development	15,582	16,154	32,478	31,829
Selling, general and administrative	31,851	30,902	64,558	58,714
Amortization of intangible assets	250	314	500	783
Gain on sale of asset				(682)
Income from operations	57,305	49,949	113,813	92,170
Interest income	309	284	585	631
Interest expense		30	5	52
Income from continuing operations before income taxes	57,614	50,203	114,393	92,749
Provision for income taxes	19,013	17,059	37,749	30,607
Income from continuing operations	38,601	33,144	76,644	62,142
Income from discontinued operations, net of taxes	0	5,633	0	5,860
Net income	$ 38,601	$ 38,777	$ 76,644	$ 68,002
Basic income per share:
Continuing operations	$ 0.74	$ 0.66	$ 1.48	$ 1.24
Discontinued operations		0.11		0.12
Net income	0.74	0.77	1.48	1.36
Diluted income per share:
Continuing operations	0.73	0.65	1.46	1.22
Discontinued operations		0.11		0.12
Net income	0.73	$ 0.76	1.46	$ 1.34
Cash dividends per common share	$ 0.15		$ 0.30
Weighted average common shares outstanding:
Basic	52,346	50,067	51,877	49,834
Diluted	52,906	50,870	52,646	50,735

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 76,644	$ 68,002
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,374	7,037
Stock-based compensation	6,048	4,310
Provision for excess and obsolete inventory	6,458	4,926
Gain on disposal of discontinued operations	0	(4,228)
Deferred income taxes	2,485	2,280
Excess tax benefits from stock-based compensation	(5,218)	(640)
Other	299	(722)
Changes in operating assets and liabilities:
Trade accounts receivable	(10,953)	(57,994)
Inventories	(12,880)	(28,280)
Income taxes	(365)	3,519
Other current assets	(9,885)	(696)
Accrued expenses and other current liabilities	2,614	27,700
Accounts payable	(2,897)	13,959
Net cash provided by operating activities	58,724	39,173
Cash flows from investing activities:
Purchases of short-term and long-term available-for-sale investments	(197,574)	(111,767)
Maturities, sales and settlements of short-term and long-term available-for-sale investments	192,944	104,544
Purchases of property, plant and equipment	(6,265)	(6,627)
Proceeds from sale of assets	4	2,113
Net proceeds from sales of discontinued operations		15,097
Other	(170)	(1,438)
Net cash (used in) provided by investing activities	(11,061)	1,922
Cash flows from financing activities:
Proceeds from short-term borrowings	13,404	71,795
Payments on short-term borrowings	(12,791)	(72,319)
Net proceeds related to employee stock	24,662	2,265
Dividend payments to common stockholders	(15,628)
Excess tax benefits from stock-based compensation	5,218	640
Net cash provided by financing activities	14,865	2,381
Effect of exchange rate changes on cash and cash equivalents	1,534	(2,963)
Increase in cash and cash equivalents	64,062	40,513
Cash and cash equivalents at beginning of period	162,476	111,009
Cash and cash equivalents at end of period	$ 226,538	$ 151,522

Basis of Presentation

6 Months Ended

Jun. 30, 2011

Basis of Presentation [Abstract]

Basis of Presentation

The terms “MKS” and the “Company” refer to MKS Instruments, Inc. and its subsidiaries. The interim financial data as of June 30, 2011 and for the three and six months ended June 30, 2011 and 2010 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, 2010 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, 2010 filed with the Securities and Exchange Commission on February 25, 2011.

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.

Cash and Cash Equivalents and Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Fair value of short-term available-for-sale investments
Fair value of short-term available-for-sale investments	$ 269,749	$ 269,457
Fair value of long-term available-for-sale investments
Fair value of long-term available-for-sale investments	5,277	0
Time deposits and drafts [Member]
Fair value of short-term available-for-sale investments
Fair value of short-term available-for-sale investments	1,597	15,716
Equity mutual fund [Member]
Fair value of short-term available-for-sale investments
Fair value of short-term available-for-sale investments, Equity mutual funds	517	491
U.S. treasury and agency obligations [Member]
Fair value of short-term available-for-sale investments
Fair value of short-term available-for-sale investments, U.S. treasury and agency obligations	267,635	253,250
Fair value of long-term available-for-sale investments
Fair value of long-term available-for-sale investments	$ 5,277	$ 0

Cash and Cash Equivalents and Investments (Details 1) - USD ($)	Jun. 30, 2011	Dec. 31, 2010
Gross unrealized gains and losses aggregated by investment category
Cost	$ 396,369,000	$ 324,279,000
Gross Unrealized Gains	60,000	42,000
Gross Unrealized (Losses)	(157,000)	(203,000)
Estimated Fair Value	396,272,000	324,118,000
Cash and Cash Equivalents and Investments (Textuals) [Abstract]
Cash	105,292,000	107,815,000
Time deposits and drafts [Member]
Gross unrealized gains and losses aggregated by investment category
Cost	31,053,000	18,554,000
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Estimated Fair Value	31,053,000	18,554,000
Money Market Funds [Member]
Gross unrealized gains and losses aggregated by investment category
Cost	16,792,000	7,032,000
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Estimated Fair Value	16,792,000	7,032,000
Equity mutual fund [Member]
Gross unrealized gains and losses aggregated by investment category
Cost	659,000	659,000
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(142,000)	(168,000)
Estimated Fair Value	517,000	491,000
U.S. treasury and agency obligations [Member]
Gross unrealized gains and losses aggregated by investment category
Cost	347,865,000	298,304,000
Gross Unrealized Gains	60,000	42,000
Gross Unrealized (Losses)	(15,000)	(35,000)
Estimated Fair Value	347,910,000	298,041,000
Cash and cash equivalents [Member]
Gross unrealized gains and losses aggregated by investment category
Cost	121,245,000	54,664,000
Gross Unrealized Gains	1,000	0
Gross Unrealized (Losses)	0	(3,000)
Estimated Fair Value	121,246,000	54,661,000
Short term investment [Member]
Gross unrealized gains and losses aggregated by investment category
Cost	269,846,000	269,615,000
Gross Unrealized Gains	58,000	42,000
Gross Unrealized (Losses)	(155,000)	(200,000)
Estimated Fair Value	269,749,000	$ 269,457,000
Long-term marketable securities [Member]
Gross unrealized gains and losses aggregated by investment category
Cost	5,278,000
Gross Unrealized Gains	1,000
Gross Unrealized (Losses)	(2,000)
Estimated Fair Value	$ 5,277,000

Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Available-for-sale securities:
Total assets	$ 1,080,615	$ 982,413
Fair Value, Measurements, Recurring [Member]
Available-for-sale securities:
Cash and Cash equivalents	121,246	54,661
Derivatives currency forward contracts	74	369
Total assets	396,346	324,487
Short-term investments	269,749	269,457
Long-term marketable securities	5,277
Other current assets, fair value	74	369
Total assets	396,346	324,487
Liabilities:
Derivatives currency forward contracts	3,301	3,463
Other liabilities, fair value disclosure	3,301	3,463
Fair Value, Measurements, Recurring [Member] \| Money Market Funds [Member]
Available-for-sale securities:
Cash and Cash equivalents	16,792	7,032
Fair Value, Measurements, Recurring [Member] \| Time deposits and drafts [Member]
Available-for-sale securities:
Cash and Cash equivalents	31,053	18,554
Fair Value, Measurements, Recurring [Member] \| Equity Securities [Member]
Available-for-sale securities:
Equity mutual funds	517	491
Fair Value, Measurements, Recurring [Member] \| U.S. treasury and agency obligations [Member]
Available-for-sale securities:
Equity mutual funds	347,910	298,041
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member]
Available-for-sale securities:
Cash and Cash equivalents	91,790	51,823
Derivatives currency forward contracts	0	0
Total assets	365,219	305,564
Short-term investments	268,152	253,741
Long-term marketable securities	5,277
Other current assets, fair value	0	0
Total assets	365,219	305,564
Liabilities:
Derivatives currency forward contracts	0
Other liabilities, fair value disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member] \| Money Market Funds [Member]
Available-for-sale securities:
Cash and Cash equivalents	16,792	7,032
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member] \| Time deposits and drafts [Member]
Available-for-sale securities:
Cash and Cash equivalents	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member] \| Equity Securities [Member]
Available-for-sale securities:
Equity mutual funds	517	491
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value, Measurements, Recurring [Member] \| U.S. treasury and agency obligations [Member]
Available-for-sale securities:
Equity mutual funds	347,910	298,041
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member]
Available-for-sale securities:
Cash and Cash equivalents	29,456	2,838
Derivatives currency forward contracts	74	369
Total assets	31,127	18,923
Short-term investments	1,597	15,716
Long-term marketable securities	0
Other current assets, fair value	74	369
Total assets	31,127	18,923
Liabilities:
Derivatives currency forward contracts	3,301	3,463
Other liabilities, fair value disclosure	3,301	3,463
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| Money Market Funds [Member]
Available-for-sale securities:
Cash and Cash equivalents	0	0
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| Time deposits and drafts [Member]
Available-for-sale securities:
Cash and Cash equivalents	31,053	18,554
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| Equity Securities [Member]
Available-for-sale securities:
Equity mutual funds	0	0
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| U.S. treasury and agency obligations [Member]
Available-for-sale securities:
Equity mutual funds	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member]
Available-for-sale securities:
Cash and Cash equivalents	0	0
Derivatives currency forward contracts	0	0
Total assets	0	0
Short-term investments	0	0
Long-term marketable securities	0
Other current assets, fair value	0	0
Total assets	0	0
Liabilities:
Derivatives currency forward contracts	0
Other liabilities, fair value disclosure	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member] \| Money Market Funds [Member]
Available-for-sale securities:
Cash and Cash equivalents	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member] \| Time deposits and drafts [Member]
Available-for-sale securities:
Cash and Cash equivalents	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member] \| Equity Securities [Member]
Available-for-sale securities:
Equity mutual funds	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Measurements, Recurring [Member] \| U.S. treasury and agency obligations [Member]
Available-for-sale securities:
Equity mutual funds	$ 0	$ 0

Derivatives (Details) - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Currency Hedged (Buy/Sell)
Currency Hedged (Buy/Sell), Gross Notional Value, Net	$ 70,244	$ 87,666
Currency Hedged (Buy/Sell), Fair Value, Net	(3,227)	(3,094)
U.S. Dollar/Japanese Yen [Member]
Currency Hedged (Buy/Sell)
Currency Hedged (Buy/Sell), Gross Notional Value, Net	33,626	50,104
Currency Hedged (Buy/Sell), Fair Value, Net	(1,632)	(2,876)
U.S. Dollar/South Korean Won [Member]
Currency Hedged (Buy/Sell)
Currency Hedged (Buy/Sell), Gross Notional Value, Net	21,123	27,574
Currency Hedged (Buy/Sell), Fair Value, Net	(1,296)	(563)
U.S. Dollar/Euro [Member]
Currency Hedged (Buy/Sell)
Currency Hedged (Buy/Sell), Gross Notional Value, Net	9,462	6,934
Currency Hedged (Buy/Sell), Fair Value, Net	(294)	305
U.S. Dollar/U.K. Pound Sterling [Member]
Currency Hedged (Buy/Sell)
Currency Hedged (Buy/Sell), Gross Notional Value, Net	6,033	3,054
Currency Hedged (Buy/Sell), Fair Value, Net	$ (5)	$ 40

Derivatives (Details 1) - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Derivative liabilities:
Total net derivative liability designated as hedging instruments	$ (3,227)	$ (3,094)
Designated as Hedging Instrument [Member]
Derivative assets:
Derivative assets	74	369
Derivative liabilities:
Derivative liabilities	(3,301)	(3,463)
Total net derivative liability designated as hedging instruments	$ (3,227)	$ (3,094)

Derivatives (Details Textuals) - USD ($)	Jun. 30, 2011	Dec. 31, 2010
Derivatives (Textuals) [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	$ 70,244,000	$ 87,666,000
Designated as Hedging Instrument [Member]
Derivatives (Textuals) [Abstract]
Derivative asset classified in other current assets	74,000	369,000
Derivative liability classified in other current liabilities	3,301,000	3,463,000
Other Current Assets [Member] \| Designated as Hedging Instrument [Member]
Derivatives (Textuals) [Abstract]
Derivative asset classified in other current assets	74,000	369,000
Other Current Liabilities [Member] \| Designated as Hedging Instrument [Member]
Derivatives (Textuals) [Abstract]
Derivative liability classified in other current liabilities	$ (3,301,000)	$ (3,463,000)

Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Inventories:
Raw materials	$ 81,967	$ 82,012
Work-in-process	22,606	21,891
Finished goods	59,877	52,526
Inventories	$ 164,450	$ 156,429

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Jun. 30, 2011	Dec. 31, 2009
Goodwill
Goodwill, Beginning balance	$ 337,765
Acquired goodwill	2,292
Sale of discontinued operation, accumulated impairment loss	53,840
Goodwill, Ending balance	279,434
Sale of discontinued operation goodwill, net	(6,783)
Impairment losses gross carrying amount	(60,623)
Accumulated impairment loss	(139,414)	$ (139,414)	$ (193,254)
Goodwill	$ 140,020	$ 140,020	$ 144,511

Goodwill and Intangible Assets (Details 1) - USD ($) $ in Thousands	Jun. 30, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, Gross	$ 110,407	$ 110,407
Accumulated Amortization	(109,164)	(108,664)
Intangible assets, net	1,243	1,743
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, Gross	76,829	76,829
Accumulated Amortization	(76,536)	(76,230)
Intangible assets, net	293	599
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, Gross	8,940	8,940
Accumulated Amortization	(8,228)	(8,083)
Intangible assets, net	712	857
Patents Trademarks Trade Names And Other [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, Gross	24,638	24,638
Accumulated Amortization	(24,400)	(24,351)
Intangible assets, net	$ 238	$ 287

Goodwill and Intangible Assets (Details 2) $ in Thousands	6 Months Ended
Goodwill and Intangible Assets (Details 2) $ in Thousands	Jun. 30, 2011 USD ($)
Estimated amortization expense
2011 (remaining)	$ 488
2012	389
2013	$ 366

Debt (Details)	6 Months Ended
Debt (Details)	Jun. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)
Debt (Textuals) [Abstract]
Number of financial institutions that provide for aggregate borrowings	2
Aggregate borrowings	$ 30,941,000
Aggregate borrowings expire and renewed	3 month intervals
Total borrowings outstanding	$ 619,000	$ 0
Interest rate of borrowing amounts	0.68%

Product Warranties (Details) - USD ($) $ in Thousands	6 Months Ended
Product Warranties (Details) - USD ($) $ in Thousands	Jun. 30, 2011	Jun. 30, 2010
Product warranty activities
Product Warranty Accrual, Beginning Balance	$ 9,865	$ 6,560
Provision for product warranties	3,638	4,731
Direct charges to warranty liability	(3,832)	(2,309)
Product Warranty Accrual, Ending Balance	$ 9,671	$ 8,982

Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Income Taxes (Textuals) [Abstract]
Effective tax rate	33.00%	34.00%	33.00%	33.00%
Gross unrecognized tax benefits excluding interest and penalties	$ 16,749,000		$ 16,749,000		$ 15,270,000
Unrecognized tax benefit that would impact effective tax rate	12,789,000		12,789,000
Accrued interest on unrecognized tax benefits	$ 1,253,000		$ 1,253,000		$ 986,000

Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Discontinued Operations (Details) - USD ($) $ in Thousands	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net revenues and income (loss) from discontinued operations
Net revenues	$ 0	$ 3,881	$ 0	$ 9,784
Income from discontinued operations before income taxes	0	786	0	1,219
Gain from disposal of discontinued operations before income taxes	0	4,228	0	4,228
Income tax benefit	0	(619)	0	(413)
Income from discontinued operations	$ 0	$ 5,633	$ 0	$ 5,860

Discontinued Operations (Details Textuals)	3 Months Ended		6 Months Ended
Discontinued Operations (Details Textuals)	Jun. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain from disposal of discontinued operations before income taxes	$ 0	$ 4,228,000	$ 0	$ 4,228,000
Discontinued Operations (Textuals) [Abstract]
Discontinued operation, number of product lines sold		2
Ion [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of discontinued operations			15,097,000
Gain from disposal of discontinued operations before income taxes			4,228,000
YDI [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of discontinued operations			490,000
Gain from disposal of discontinued operations before income taxes			$ 224,000

Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Comprehensive Income (Details) - USD ($) $ in Thousands	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Components of comprehensive income
Net income	$ 38,601	$ 38,777	$ 76,644	$ 68,002
Other comprehensive income (loss):
Changes in value of financial instruments designated as cash flow hedges (net of tax)	(517)	(905)	(123)	(690)
Foreign currency translation adjustments	2,207	(2,953)	5,331	(4,921)
Unrealized (loss) gain on investments (net of tax)	(8)	(40)	37	(74)
Other comprehensive income (loss)	1,682	(3,898)	5,245	(5,685)
Total comprehensive income	$ 40,283	$ 34,879	$ 81,889	$ 62,317

Geographic, Product and Significant Customer Information (Details Textuals)	6 Months Ended
	Jun. 30, 2011
Geographic, Product and Significant Customer Information (Textuals) [Abstract]
Number of product groups	3

Subsequent Events (Details)	3 Months Ended
Subsequent Events (Details)	Jun. 30, 2011 USD ($) $ / shares
Subsequent Events (Textuals) [Abstract]
Repurchase of common stock \| $	$ 200,000,000
Cash dividend declared \| $ / shares	$ 0.15