CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Net income (loss)	$ (275,970)		$ (2,270,833)		$ 905,611
Other comprehensive loss, net of tax
Net gain (loss) from foreign currency translation	66,449		(546,705)		(271,491)
Retirement and postretirement benefit plans	7,955		10,492		(72,796)
Deferred loss on interest rate hedges reclassified to interest expense	1,926		1,926		1,913
Other comprehensive income (loss)	76,330	[1]	(534,287)	[1]	(342,374)
Comprehensive income (loss)	$ (199,640)		$ (2,805,120)		$ 563,237

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