CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net loss	$ (158,643)	$ (98,902)	$ (2,693,903)	$ (342,471)
Other comprehensive income (loss):
Change in pension and other postretirement benefit plans (net of tax: $2,134 and $7,017 for the three and nine months ended September 30, 2015, and $1,833 and $6,155 for the three and nine months ended September 30, 2014)	4,007	2,977	11,406	9,994
Change in unrealized gain on hedges (net of tax: $1,034)	0	0	0	1,679
Change in foreign currency translation adjustment	(13,922)	(21,672)	(10,827)	(8,244)
Total other comprehensive income (loss)	(9,915)	(18,695)	579	3,429
Total comprehensive loss	$ (168,558)	$ (117,597)	$ (2,693,324)	$ (339,042)