CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 124,080	$ 138,237	$ 151,099
Other comprehensive loss:
Unrealized gain (loss) on available-for-sale securities, net of tax	(14)	(7)	21
Comprehensive income	$ 124,066	$ 138,230	$ 151,120