CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (98,902)	$ (100,724)	$ (342,471)	$ (184,660)
Other comprehensive income (loss):
Change in pension and postretirement benefit plans (net of tax: $1,833 and $6,155 and $2,882 and $8,647 for the three and nine months ended September 30, 2014 and 2013, respectively)	2,977	4,659	9,994	13,976
Change in unrealized gain on hedges (net of tax: $1,034 for the nine months ended September 30, 2014 and $409 and $1,076 for the three and nine months ended September 30, 2013, respectively)	0	653	1,679	1,901
Change in foreign currency translation adjustment	(21,672)	14,847	(8,244)	(2,239)
Change in unrealized loss on investments, net of tax	0	(940)	0	(897)
Total other comprehensive income (loss)	(18,695)	19,219	3,429	12,741
Total comprehensive loss	$ (117,597)	$ (81,505)	$ (339,042)	$ (171,919)