UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 29,023	$ 36,244	$ 40,595	$ 37,220
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on available-for-sale securities	296	(236)	232	(93)
Reclassification adjustment for losses on available-for-sale securities included in net income	0	332	0	332
Unrealized loss on interest rate hedge	(3,000)	(9,014)	(21,382)	(14,031)
Reclassification adjustment for losses on interest rate hedge included in net income	2,130	397	3,228	755
Foreign currency translation adjustments	18,102	13,597	(23,856)	22,137
Other comprehensive income (loss), net of tax	17,528	5,076	(41,778)	9,100
Comprehensive income (loss)	$ 46,551	$ 41,320	$ (1,183)	$ 46,320