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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 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]                    
Provision for income taxes $ (31,359)   $ (2,695) $ (66,314) $ (7,899)   $ (14,858) $ (5,247) $ (46,217) $ (71,561)
Other non-operating expense, net (1,264)     (1,911)         (2,874) (4,366)
Loss before income taxes 101,955   (173,601) 72,592 (230,064)   (269,425) (543,969) (167,470) (471,377)
Net Income (Loss) 70,596 $ (107,987) $ (176,296) 6,278 $ (237,963) $ (311,253) $ (284,283) $ (549,216) (213,687) (542,938)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Derivative Instruments                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]                    
Cost of sales 6,583               10,185  
Provision for income taxes (189)               (540)  
Net Income (Loss) 6,394               9,645  
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Derivative Instruments                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]                    
Cost of sales       (910)           (10,060)
Provision for income taxes       123           56
Net Income (Loss)       (787)           (10,004)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Defined Benefit Pension Plans                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]                    
Provision for income taxes 0     0         (185) 11
Loss before income taxes (1,242)     (1,543)         (3,728) (7,346)
Net Income (Loss) (1,242)     (1,543)         (3,913) (7,335)
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 expense, net 494     502         1,480 1,505
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 expense, net $ (1,736)     $ (2,045)         (5,208) (6,408)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Settlement loss                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]                    
Other non-operating expense, net                 $ 0 $ (2,443)