CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
NET SALES	$ 890,651us-gaap_SalesRevenueNet	$ 826,846us-gaap_SalesRevenueNet	$ 633,806us-gaap_SalesRevenueNet
COST OF GOODS SOLD	613,372us-gaap_CostOfGoodsSold	589,010us-gaap_CostOfGoodsSold	472,220us-gaap_CostOfGoodsSold
Gross profit	277,279us-gaap_GrossProfit	237,836us-gaap_GrossProfit	161,586us-gaap_GrossProfit
OPERATING EXPENSES
Selling, general and administrative	133,701	132,106	101,363
Research and development	52,136us-gaap_ResearchAndDevelopmentExpense	48,302us-gaap_ResearchAndDevelopmentExpense	33,761us-gaap_ResearchAndDevelopmentExpense
Amortization of acquisition related intangible assets	7,914us-gaap_AmortizationOfAcquisitionCosts	8,078us-gaap_AmortizationOfAcquisitionCosts	5,122us-gaap_AmortizationOfAcquisitionCosts
Impairment of goodwill		5,318us-gaap_GoodwillImpairmentLoss
Restructuring		1,535us-gaap_RestructuringCharges
Loss (gain) on sale of assets	(983)us-gaap_GainLossOnSaleOfOtherAssets	216us-gaap_GainLossOnSaleOfOtherAssets	(3,556)us-gaap_GainLossOnSaleOfOtherAssets
Total operating expenses	192,768us-gaap_OperatingExpenses	195,555us-gaap_OperatingExpenses	136,690us-gaap_OperatingExpenses
Income from operations	84,511us-gaap_OperatingIncomeLoss	42,281us-gaap_OperatingIncomeLoss	24,896us-gaap_OperatingIncomeLoss
OTHER INCOME (EXPENSES)
Interest income	1,470	1,274	778
Interest expense	(4,332)us-gaap_InterestExpense	(5,580)us-gaap_InterestExpense	(876)us-gaap_InterestExpense
Gain on securities carried at fair value	1,364	601	7,100
Other	2,979us-gaap_OtherNoninterestExpense	9us-gaap_OtherNoninterestExpense	(1,091)us-gaap_OtherNoninterestExpense
Total other income (expenses)	1,481us-gaap_NonoperatingIncomeExpense	(3,696)us-gaap_NonoperatingIncomeExpense	5,911us-gaap_NonoperatingIncomeExpense
Income before income taxes and noncontrolling interest	85,992	38,585	30,807
INCOME TAX PROVISION	20,359us-gaap_IncomeTaxExpenseBenefit	14,481us-gaap_IncomeTaxExpenseBenefit	4,825us-gaap_IncomeTaxExpenseBenefit
NET INCOME	65,633us-gaap_ProfitLoss	24,104us-gaap_ProfitLoss	25,982us-gaap_ProfitLoss
Less: NET (INCOME) LOSS attributable to noncontrolling interest	(1,955)	2,428	(1,830)
NET INCOME attributable to common stockholders	$ 63,678us-gaap_NetIncomeLoss	$ 26,532us-gaap_NetIncomeLoss	$ 24,152us-gaap_NetIncomeLoss
EARNINGS PER SHARE attributable to common stockholders
Basic	$ 1.35us-gaap_EarningsPerShareBasic	$ 0.57us-gaap_EarningsPerShareBasic	$ 0.53us-gaap_EarningsPerShareBasic
Diluted	$ 1.31us-gaap_EarningsPerShareDiluted	$ 0.56us-gaap_EarningsPerShareDiluted	$ 0.51us-gaap_EarningsPerShareDiluted
Number of shares used in computation
Basic	47,184	46,363	45,780
Diluted	48,594	47,658	46,899

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 4

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

-Section 30

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34747878&loc=d3e3636-108311

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

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-Publisher FASB

-Name Accounting Standards Codification

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