CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 105,194	$ 106,352	$ 328,671	$ 312,436
Other comprehensive income (loss):
Reclassification adjustments for derivatives, net of tax	1,210	1,244	3,661	3,764
Pension and other postretirement adjustments, net of tax	1,663	1,270	4,181	3,979
Cumulative translation adjustment	(37,825)	9,164	(38,478)	(25,903)
Other comprehensive income (loss)	(34,952)	11,678	(30,636)	(18,160)
Comprehensive income	$ 70,242	$ 118,030	$ 298,035	$ 294,276