CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income	$ 327,160	$ 261,057	$ 240,256
Other comprehensive income/(loss):
Change in foreign currency translation adjustments, net of tax	4,498	6,295	(21,338)
Change in unrealized gain/(loss) on hedging instruments, net of tax	2,350	3,845	(2,553)
Defined benefit pension plans - actuarial loss, net of tax	(986)	0	0
Other comprehensive income/(loss)	5,862	10,140	(23,891)
Comprehensive income	$ 333,022	$ 271,197	$ 216,365