Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net (loss) income	$ (119,400)	$ (161,600)	$ 29,000	$ (70,900)
Other comprehensive income (loss):
Change in derivative instruments designated as cash flow hedges, net of tax	1,300	(400)	1,700	2,800
Foreign currency translation adjustments	2,400	(6,600)	3,400	(8,700)
Benefit plan adjustments, net of tax	1,600	2,200	3,200	4,400
Other comprehensive income (loss)	5,300	(4,800)	8,300	(1,500)
Comprehensive (loss) income	$ (114,100)	$ (166,400)	$ 37,300	$ (72,400)