CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net Loss	$ (56,075)	$ (19,114)	$ (169,306)	$ (92,073)
Other Comprehensive Income (Loss), Net of Tax:
Currency translation adjustments	51,067	(44,377)	105,336	(4,356)
Defined benefit pension plan adjustments	1,024	1,459	2,079	2,544
Net unrealized loss on available-for-sale security	(2,423)	0	(3,737)	0
Net unrealized (losses) gains on derivative instruments:
Unrealized holding (losses) gains	(27,406)	15,561	(39,990)	(332)
Reclassification adjustment for realized gains included in net income	(364)	(3,305)	(2,593)	(10,315)
Net unrealized (losses) gains on derivative instruments	(27,770)	12,256	(42,583)	(10,647)
Other Comprehensive Income (Loss), Net of Tax	21,898	(30,662)	61,095	(12,459)
Comprehensive Loss	$ (34,177)	$ (49,776)	$ (108,211)	$ (104,532)

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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