Condensed Consolidated Statement Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 68,347	$ 35,809	$ 109,747	$ 117,702
Other comprehensive (loss) income:
Net foreign currency translation adjustment	3,399	819	(102)	(1,850)
Actuarial gain on Dutch pension plans	0	0	6,299	0
Unrealized gain (loss) on fair value of derivative instruments	0	(19)	1,642	(2,061)
Total comprehensive income	$ 71,746	$ 36,609	$ 117,586	$ 113,791