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 income	$ 1,298	$ 423,635	$ 531,451
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	33,224	8,795	(25,010)
Derivative financial instruments	(31,530)	(16,371)
Derivative financial instruments			20,009
Pension and postretirement benefit plans	51,838	100,311	(16,286)
Total other comprehensive loss, net of tax	53,532	92,735	(21,287)
Comprehensive income	$ 54,830	$ 516,370	$ 510,164