CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Loss	$ (113,231)	$ (72,959)
Other Comprehensive Income, Net of Tax:
Currency translation adjustments	54,269	40,021
Defined benefit pension plan adjustments	1,055	1,085
Net unrealized loss on available-for-sale security	(1,314)	0
Net unrealized losses on derivative instruments:
Unrealized holding losses	(12,584)	(15,893)
Reclassification adjustment for realized gains included in net income	(2,229)	(7,010)
Net unrealized (losses) gains on derivative instruments	(14,813)	(22,903)
Other Comprehensive Income, Net of Tax	39,197	18,203
Comprehensive Loss	$ (74,034)	$ (54,756)