Accumulated Other Comprehensive Income (Loss) - Reclassification from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
(Benefit) Provision for income taxes	$ (456,754)			$ 22,080			$ (415,805)	$ 46,811
Other non-operating expense, net	3,901			1,327			3,347	7,012
Loss before income taxes	(333,864)			(328,214)			(250,206)	(34,193)
Net Income (Loss)	(795,076)	$ 5,537	$ 112,385	(311,338)	$ 111,109	$ 205,702	(677,154)	5,473
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Derivative Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	2,322			2,143			3,191	11,086
(Benefit) Provision for income taxes	(99)			57			(298)	151
Net Income (Loss)	2,223			2,200			2,893	11,237
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | Employee Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
(Benefit) Provision for income taxes	2,182			141			2,120	807
Loss before income taxes	(5,750)			(1,864)			(10,516)	(5,609)
Net Income (Loss)	(3,568)			(1,723)			(8,396)	(4,802)
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	455			472			1,253	1,405
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	(2,830)			(2,336)			(8,394)	(7,014)
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	$ (3,375)			$ 0			$ (3,375)	$ 0