Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (29,102)	$ 621,085	$ 810,474
Foreign currency translation adjustments	102,595	67,902	(200,490)
Cash flow hedge adjustments, net of income taxes in 2020 — $3,453, 2019 — $5,932, and 2018 — $1,713	(9,336)	(16,039)	(4,631)
Pension and postretirement benefit adjustments, net of income taxes of 2020 — $4,639, 2019 — $5,036, and 2018 — $21,297	11,547	44,433	(57,365)
Other comprehensive income (loss), net of tax	104,806	96,296	(262,486)
Comprehensive income	$ 75,704	$ 717,381	$ 547,988