Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income (loss)	$ 31,100	$ 5,508	$ 33,477	$ (5,634)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Unrealized foreign currency translation gains (losses)	(17)	493	372	356
Change in fair value of available-for-sale investment	0	988	157	1,478
Realized gains of available-for-sale investment reclassified into Other income (expense), net	0	0	(561)	0
Net other comprehensive income (loss) related to available-for-sale investment	0	988	(404)	1,478
Unrealized losses on derivatives for the period	(11,187)	(22,190)	(2,125)	(4,401)
Derivative (gains) losses reclassified into Net sales	6,582	0	15,214	(4,381)
Derivative gains reclassified into Cost of sales	(2,151)	(4,139)	(4,990)	(9,653)
Net other comprehensive income (loss) related to derivatives	(6,756)	(26,329)	8,099	(18,435)
Actuarial gains (losses) for the period, net of $15, $6, $(130) and $(275), respectively, of income tax expense (benefit)	15	179	(1,406)	571
Pension cost amortization	338	266	676	531
Net other comprehensive income (loss) related to defined benefit pension and severance plans	353	445	(730)	1,102
Other comprehensive income (loss), net of tax	(6,420)	(24,403)	7,337	(15,499)
Comprehensive income (loss)	$ 24,680	$ (18,895)	$ 40,814	$ (21,133)