Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Net sales	$ 698,218us-gaap_Revenues	$ 734,177us-gaap_Revenues	$ 807,336us-gaap_Revenues
Cost of sales	545,356us-gaap_CostOfRevenue	579,109us-gaap_CostOfRevenue	564,089us-gaap_CostOfRevenue
Gross profit	152,862us-gaap_GrossProfit	155,068us-gaap_GrossProfit	243,247us-gaap_GrossProfit
Operating expenses
Selling, general and administrative expenses	126,954	85,767	82,677
Research and development expenses	92,765us-gaap_ResearchAndDevelopmentExpense	87,862us-gaap_ResearchAndDevelopmentExpense	76,255us-gaap_ResearchAndDevelopmentExpense
Restructuring and impairment charges	10,269	8,207
Total operating expenses	229,988us-gaap_OperatingExpenses	181,836us-gaap_OperatingExpenses	158,932us-gaap_OperatingExpenses
Operating income (loss)	(77,126)us-gaap_OperatingIncomeLoss	(26,768)us-gaap_OperatingIncomeLoss	84,315us-gaap_OperatingIncomeLoss
Interest expense, net	(16,289)	(20,360)	(22,600)
Foreign currency gain (loss), net	(24,650)	16,837	57,280
Loss on early extinguishment of senior notes		(32,812)
Other income, net	2,356us-gaap_OtherNonoperatingIncomeExpense	2,870us-gaap_OtherNonoperatingIncomeExpense	3,890us-gaap_OtherNonoperatingIncomeExpense
Income (loss) before income taxes	(115,709)	(60,233)	122,885
Income tax expenses	1,523us-gaap_IncomeTaxExpenseBenefit	3,970us-gaap_IncomeTaxExpenseBenefit	12,847us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	$ (117,232)us-gaap_NetIncomeLoss	$ (64,203)us-gaap_NetIncomeLoss	$ 110,038us-gaap_NetIncomeLoss
Earnings (loss) per common share-
Basic	$ (3.44)us-gaap_EarningsPerShareBasic	$ (1.82)us-gaap_EarningsPerShareBasic	$ 3.01us-gaap_EarningsPerShareBasic
Diluted	$ (3.44)us-gaap_EarningsPerShareDiluted	$ (1.82)us-gaap_EarningsPerShareDiluted	$ 2.93us-gaap_EarningsPerShareDiluted
Weighted average number of shares-
Basic	34,055,513	35,232,194	36,567,684
Diluted	34,055,513	35,232,194	37,533,391

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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