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	$ 377,778	$ 425,521	$ 410,573
Other comprehensive income (loss):
Reclassification adjustments for derivatives, net of tax	4,652	4,882	5,006
Pension and other postretirement adjustments, net of tax	1,385	(3,069)	9,825
Cumulative translation adjustment	107,783	67	(48,114)
Other comprehensive income (loss)	113,820	1,880	(33,283)
Comprehensive income	$ 491,598	$ 427,401	$ 377,290