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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 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other non-operating (income) expense, net $ 294   $ (3,063)   $ (1,610) $ (2,455)
Loss before income taxes (95,824)   (234,022)   (273,373) (547,927)
Tax effect of net gain (loss) (12,163)   (6,909)   (18,332) (4,257)
Net Loss (107,987) $ (183,718) (240,931) $ (311,253) (291,705) (552,184)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Derivative Instruments            
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]            
Cost of sales 2,675       3,602  
Tax effect of net gain (loss) (183)       (351)  
Net Loss 2,492       3,251  
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Derivative Instruments            
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]            
Cost of sales     (4,767)     (9,150)
Tax effect of net gain (loss)     (19)     (67)
Net Loss     (4,786)     (9,217)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Defined Benefit Pension Plans            
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]            
Loss before income taxes (1,242)   (3,945)   (2,486) (5,803)
Tax effect of net gain (loss) 0   (23)   (185) 11
Net Loss (1,242)   (3,968)   (2,671) (5,792)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Amortization of prior service credit            
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other non-operating (income) expense, net 493   502   986 1,003
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Recognized actuarial loss            
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other non-operating (income) expense, net (1,735)   (2,046)   (3,472) (4,363)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Settlement loss            
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other non-operating (income) expense, net $ 0   $ (2,401)   $ 0 $ (2,443)