Accumulated Other Comprehensive Income (Loss) - Classification and Amount of Reclassifications from Accumulated Other Comprehensive Income to Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax effect of net loss	$ (66,314)	$ (664,510)	$ (70,571)	$ (614,402)
Net Income (Loss)	6,278	(603,247)	(545,906)	(772,553)
Loss Before Income Taxes	72,592	61,263	(475,335)	(158,151)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Derivative Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Income (Loss)	(787)	(9,241)	(10,004)	(6,648)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Derivative Instruments | Loss on foreign currency forward exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	(910)	(9,124)	(10,060)	(6,658)
Tax effect of net loss	123	(117)	56	10
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Defined Benefit Pension Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax effect of net loss	0	659	11	2,111
Net Income (Loss)	(1,543)	(1,209)	(7,335)	(3,488)
Amortization of prior service credit (cost)	502	(8)	1,505	(23)
Recognized actuarial loss	(2,045)	(1,860)	(6,408)	(5,576)
Loss Before Income Taxes	$ (1,543)	$ (1,868)	(7,346)	(5,599)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Defined Benefit Pension Plans | Other non-operating expense, net
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Settlement loss			$ (2,443)	$ 0