Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Net sales	$ 172,070us-gaap_Revenues	$ 193,533us-gaap_Revenues	$ 336,234us-gaap_Revenues	$ 387,855us-gaap_Revenues
Cost of sales	136,613us-gaap_CostOfRevenue	148,292us-gaap_CostOfRevenue	260,500us-gaap_CostOfRevenue	284,379us-gaap_CostOfRevenue
Gross profit	35,457us-gaap_GrossProfit	45,241us-gaap_GrossProfit	75,734us-gaap_GrossProfit	103,476us-gaap_GrossProfit
Selling, general and administrative expenses	30,746	20,951	55,773	41,759
Research and development expenses	24,059us-gaap_ResearchAndDevelopmentExpense	21,625us-gaap_ResearchAndDevelopmentExpense	47,196us-gaap_ResearchAndDevelopmentExpense	42,640us-gaap_ResearchAndDevelopmentExpense
Restructuring and impairment charges				2,446
Operating income (loss)	(19,348)us-gaap_OperatingIncomeLoss	2,665us-gaap_OperatingIncomeLoss	(27,235)us-gaap_OperatingIncomeLoss	16,631us-gaap_OperatingIncomeLoss
Other income (expenses)
Interest expense, net	(4,007)	(5,879)	(8,077)	(11,728)
Foreign currency gain (loss), net	38,424	(22,145)	29,018	(45,603)
Other	597us-gaap_OtherNonoperatingIncomeExpense	327us-gaap_OtherNonoperatingIncomeExpense	1,158us-gaap_OtherNonoperatingIncomeExpense	680us-gaap_OtherNonoperatingIncomeExpense
Net other income (expenses)	35,014us-gaap_NonoperatingIncomeExpense	(27,697)us-gaap_NonoperatingIncomeExpense	22,099us-gaap_NonoperatingIncomeExpense	(56,651)us-gaap_NonoperatingIncomeExpense
Income (loss) before income taxes	15,666	(25,032)	(5,136)	(40,020)
Income tax expenses (benefits)	656us-gaap_IncomeTaxExpenseBenefit	(364)us-gaap_IncomeTaxExpenseBenefit	1,459us-gaap_IncomeTaxExpenseBenefit	2,237us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	$ 15,010us-gaap_NetIncomeLoss	$ (24,668)us-gaap_NetIncomeLoss	$ (6,595)us-gaap_NetIncomeLoss	$ (42,257)us-gaap_NetIncomeLoss
Earnings (loss) per common share-
Basic	$ 0.44us-gaap_EarningsPerShareBasic	$ (0.70)us-gaap_EarningsPerShareBasic	$ (0.19)us-gaap_EarningsPerShareBasic	$ (1.19)us-gaap_EarningsPerShareBasic
Diluted	$ 0.43us-gaap_EarningsPerShareDiluted	$ (0.70)us-gaap_EarningsPerShareDiluted	$ (0.19)us-gaap_EarningsPerShareDiluted	$ (1.19)us-gaap_EarningsPerShareDiluted
Weighted average number of shares-
Basic	34,056,359	35,474,001	34,054,626	35,506,527
Diluted	35,177,915	35,474,001	34,054,626	35,506,527

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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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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The net amount of nonoperating interest income (expense).

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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The net result for the period of deducting operating expenses from operating revenues.

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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The aggregate amount provided for estimated restructuring charges, remediation costs, and asset impairment loss during an accounting period. Generally, these items are either unusual or infrequent, but not both (in which case they would be extraordinary items).

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