CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Net loss	$ (311,789)	$ (275,970)	[1]	$ (2,270,833)	[1]
Other comprehensive income (loss), net of tax
Net gain (loss) from foreign currency translation	171,725	66,449		(546,705)
Retirement and postretirement benefit plans	(7,682)	7,955		10,492
Deferred loss on interest rate hedges reclassified to interest expense	1,926	1,926		1,926
Other comprehensive income (loss)	165,969	76,330		(534,287)
COMPREHENSIVE LOSS	$ (145,820)	$ (199,640)		$ (2,805,120)

[1] Reclassified to conform to current presentation (see Note A).