CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 115,656	$ 89,432	$ 339,373	$ 241,621
Other comprehensive loss:
Change in foreign currency translation adjustments, net of tax	(10,761)	199	(11,655)	(15,878)
Change in unrealized loss on hedging instruments, net of tax	(2,067)	(498)	(4,108)	(3,420)
Defined benefit pension plans - actuarial loss, net of tax	0	0	(626)	0
Other comprehensive loss	(12,828)	(299)	(16,389)	(19,298)
Comprehensive income	$ 102,828	$ 89,133	$ 322,984	$ 222,323