Condensed Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,749	$ 21,562	$ 35,230	$ 50,982
Other comprehensive loss:
Unrealized loss on marketable securities, net of tax	(1,826)	(1,224)	(5,585)	(4,766)
Other comprehensive loss	(1,826)	(1,224)	(5,585)	(4,766)
Comprehensive earnings (loss)	$ (77)	$ 20,338	$ 29,645	$ 46,216