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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
Mar. 31, 2018
Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cost of sales $ (489,499) $ (456,840)
Tax effect of net (loss) gain 2,652 32,440
Net Loss (311,253) (113,231)
Loss Before Income Taxes (313,905) (145,671)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Derivative Instruments | (Loss) gain on foreign currency forward exchange contracts    
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cost of sales (4,383) 2,207
Tax effect of net (loss) gain (48) 22
Net Loss (4,431) 2,229
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) gain 34 710
Net Loss (1,824) (1,155)
Amortization of prior service credit (cost) 501 (8)
Recognized actuarial loss (2,317) (1,857)
Loss Before Income Taxes (1,858) (1,865)
Other non-operating income/expense | Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Defined Benefit Pension Plans    
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Settlement loss $ (42) $ 0