Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net income (loss)	$ 59,588	$ 17,836	$ (5,038)	$ (6,767)
Other comprehensive income (loss), net of tax, where applicable: [Abstract]
Unrealized foreign currency translation gains (losses)	0	(1)	2	15
Realized (gains) losses for foreign currency translation on business disposal reclassified into Other income (expense), net	(43)	0	559	252
Net other comprehensive income (loss) related to foreign currency translation	(43)	(1)	561	267
Unrealized gains (losses) on derivatives for the period	(2,270)	4,441	16,004	3,395
Derivative (gains) losses reclassified into Net sales	(13,829)	1,020	(30,807)	2,047
Derivative (gains) losses reclassified into Cost of sales	3,465	(61)	12,240	(236)
Net other comprehensive income (loss) related to derivatives	(12,634)	5,400	(2,563)	5,206
Actuarial gains (losses) for the period, net of $0, $0, $120 and $259, respectively, of income tax benefit	1,095	(563)	3,267	(905)
Amortization included in pension cost	315	296	599	596
Net other comprehensive income (loss) related to defined benefit pension and severance plans	1,410	(267)	3,866	(309)
Other comprehensive income (loss), net of tax	(11,267)	5,132	1,864	5,164
Comprehensive income (loss)	$ 48,321	$ 22,968	$ (3,174)	$ (1,603)