Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Retained Earnings [Member]
BALANCE at Dec. 31, 2021	$ 650,110	$ 887	$ (276,895)	$ 674,242	$ (96)	$ 251,972
BALANCE, shares at Dec. 31, 2021		88,724,000
BALANCE, shares at Dec. 31, 2021			(19,976,000)
Net income	32,078					32,078
Foreign currency translation	(81)				(81)
Unrealized gain (loss) on investments, net of tax	(1,364)				(1,364)
Treasury stock purchased	(3,828)		$ (3,828)
Treasury stock purchased, shares			(363,000)
Share-based compensation expense	2,416			2,416
Common stock issued	(951)	$ 6	$ (1,610)	653
Common stock issued, shares		540,000	(146,000)
BALANCE at Mar. 31, 2022	678,380	$ 893	$ (282,333)	677,311	(1,541)	284,050
BALANCE, shares at Mar. 31, 2022		89,264,000
BALANCE, shares at Mar. 31, 2022			(20,485,000)
BALANCE at Dec. 31, 2022	$ 725,845	$ 894	$ (301,624)	684,183	(5,447)	347,839
BALANCE, shares at Dec. 31, 2022	89,396,192	89,396,000
BALANCE, shares at Dec. 31, 2022	(22,220,707)		(22,221,000)
Net income	$ 34,484					34,484
Foreign currency translation	26				26
Unrealized gain (loss) on investments, net of tax	1,300				1,300
Treasury stock purchased	(815)		$ (815)
Treasury stock purchased, shares			(60,000)
Share-based compensation expense	2,294			2,294
Common stock issued	(1,962)	$ 5	$ (2,209)	242
Common stock issued, shares		528,000	(165,000)
BALANCE at Mar. 31, 2023	$ 761,172	$ 899	$ (304,648)	$ 686,719	$ (4,121)	$ 382,323
BALANCE, shares at Mar. 31, 2023	89,923,857	89,924,000
BALANCE, shares at Mar. 31, 2023	(22,445,861)		(22,446,000)