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	$ 99,897	$ 118,703	$ 85,887
Other comprehensive income (loss)
Unrealized holding gain (loss), net of tax	2,177	593	(549)
Comprehensive income	$ 102,074	$ 119,296	$ 85,338