CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 215,525	$ 279,881	$ 176,186
Available-for-sale investments:
Net unrealized gain (loss), net of tax of $(5,943), $(2,206), and $981 in 2022, 2021, and 2020, respectively	(17,152)	(7,152)	6,478
Reclassification of net realized (gain) loss into current operations	182	(236)	(4,119)
Net change related to available-for-sale investments	(16,970)	(7,388)	2,359
Foreign currency translation adjustments:
Foreign currency translation gain (loss)	(4,385)	(6,753)	1,115
Net change related to foreign currency translation adjustments	(4,385)	(6,753)	1,115
Other comprehensive income (loss), net of tax	(21,355)	(14,141)	3,474
Total comprehensive income	$ 194,170	$ 265,740	$ 179,660