CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 97,740	$ 65,636	$ 100,739
Other comprehensive income (loss), net of tax:
Unrealized (losses) gains on available-for-sale securities	(120)	77	32
Reclassification adjustment for losses on available-for-sale securities included in net income	332	0	143
Unrealized loss on interest rate hedge	(14,401)	(9,579)	0
Reclassification adjustment for losses on interest rate hedge included in net income	2,335	806	0
Foreign currency translation adjustments	25,130	(42,350)	41,636
Unfunded pension liability	44	82	108
Other comprehensive (loss) income	13,320	(50,964)	41,919
Comprehensive income (loss)	$ 111,060	$ 14,672	$ 142,658