Condensed Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net earnings	$ 7,865	$ 23,726	$ 33,481	$ 29,420
Other comprehensive earnings
Unrealized loss on marketable securities, net of tax	(1,447)	(816)	(3,759)	(3,542)
Other comprehensive loss	(1,447)	(816)	(3,759)	(3,542)
Comprehensive earnings	$ 6,418	$ 22,910	$ 29,722	$ 25,878