Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (62,536)us-gaap_NetIncomeLoss	$ (15,815)us-gaap_NetIncomeLoss	$ (405,017)us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax where applicable:
Unrealized foreign currency translation gains (losses)	16	(349)	(194)
Realized losses for foreign currency translation on business disposal reclassified into Other income (expense), net	163	0	0
Net other comprehensive income (loss) related to foreign currency translation	179	(349)	(194)
Change in fair value of available-for-sale investment	0	157	1,944
Realized gains of available-for-sale investment reclassified into Other income (expense), net	0	(561)	(722)
Net other comprehensive income (loss) related to available-for-sale investment	0	(404)	1,222
Unrealized gains (losses) on derivatives for the period	15,871	(11,111)	(16,928)
Derivative (gains) losses reclassified into Net sales	(7,391)	29,858	(1,240)
Derivative (gains) losses reclassified into Cost of sales	4,473	(7,839)	(16,053)
Net other comprehensive income (loss) related to derivatives	12,953	10,908	(34,221)
Actuarial gains (losses) for the period, net of $(401), $247 and $283, respectively, of income tax expense (benefit)	(8,620)	3,230	189
Pension cost amortization	1,189	1,357	789
Net other comprehensive income (loss) related to defined benefit pension and severance plans	(7,431)	4,587	978
Other comprehensive income (loss), net of tax	5,701	14,742	(32,215)
Comprehensive income (loss)	$ (56,835)us-gaap_ComprehensiveIncomeNetOfTax	$ (1,073)us-gaap_ComprehensiveIncomeNetOfTax	$ (437,232)us-gaap_ComprehensiveIncomeNetOfTax

Other Comprehensive Income (Loss), Reclassification Adjustment into Cost of Sales from AOCI on Derivatives, Net of Tax

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Other Comprehensive Income (Loss), Reclassification Adjustment into Sales from AOCI on Derivatives, Net of Tax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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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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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans, attributable to parent entity.

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Amount after tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount after tax of reclassification adjustment from accumulated other comprehensive (income) loss related to net period benefit cost (credit) for pension and other postretirement defined benefit plans.

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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