CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net loss	$ (2,455,064)	$ (151,391)	$ (2,535,260)	$ (243,569)
Other comprehensive income:
Change in pension and other postretirement benefit plans (net of tax: $2,441 and $4,883 and $2,154 and $4,322 for the three and six months ended June 30, 2015 and 2014, respectively)	3,700	3,498	7,399	7,017
Change in unrealized gain on hedges (net of tax: $1,034 for the six months ended June 30, 2014)	0	0	0	1,679
Change in foreign currency translation adjustment	21,420	11,264	3,095	13,428
Total other comprehensive income	25,120	14,762	10,494	22,124
Total comprehensive loss	$ (2,429,944)	$ (136,629)	$ (2,524,766)	$ (221,445)