CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 70,864	$ 113,209	$ 172,862	$ 223,477
Other comprehensive income (loss):
Reclassification adjustments for derivatives, net of tax	2,116	1,224	3,310	2,451
Pension and other postretirement adjustments, net of tax	(631)	1,256	1,665	2,518
Cumulative translation adjustment	19,271	2,628	(7,185)	(653)
Other comprehensive income (loss)	20,756	5,108	(2,210)	4,316
Comprehensive income	$ 91,620	$ 118,317	$ 170,652	$ 227,793