CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 113,234	$ 215,525	$ 279,881
Available-for-sale investments:
Net unrealized gain (loss), net of tax of $4,389, $(5,943), and $(2,206) in 2023, 2022, and 2021, respectively		(17,152)	(7,152)
Reclassification of net realized (gain) loss into current operations	1,954	182	(236)
Net change related to available-for-sale investments	12,461	(16,970)	(7,388)
Foreign currency translation adjustments:
Foreign currency translation gain (loss)	11,500	(4,385)	(6,753)
Net change related to foreign currency translation adjustments	11,500	(4,385)	(6,753)
Other comprehensive income (loss), net of tax	23,961	(21,355)	(14,141)
Total comprehensive income	$ 137,195	$ 194,170	$ 265,740