UNAUDITED CONSOLIDATED STATEMENTS 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	$ 54,910	$ 36,369	$ 95,505	$ 73,589
Other comprehensive income (loss), net of tax:
Unrealized (losses) gains on available-for-sale securities	(121)	9	111	(84)
Reclassification adjustment for losses on available-for-sale securities included in net income	0	0	0	332
Unrealized loss on interest rate hedge	(123)	(3,865)	(21,505)	(17,896)
Reclassification adjustment for losses on interest rate hedge included in net income	2,468	614	5,696	1,369
Foreign currency translation adjustments	10,161	(6,177)	(13,695)	15,960
Other comprehensive income (loss), net of tax	12,385	(9,419)	(29,393)	(319)
Comprehensive income	$ 67,295	$ 26,950	$ 66,112	$ 73,270