CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (73,834)	$ 129,412	$ (88,275)		$ 284,665
Other comprehensive income (loss), net of tax
Net income (loss) from foreign currency translation	31,981	133,559	(266,614)		(3,045)
Retirement and postretirement benefit plans	2,695	1,026	5,989		2,491
Deferred loss on interest rate hedges reclassified to interest expense	481	483	963		966
Other comprehensive income (loss)	35,157	135,068	(259,662)	[1]	412
Comprehensive Income (Loss)	$ (38,677)	$ 264,480	$ (347,937)		$ 285,077

[1] All amounts are presented net of income taxes.