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, 2022	$ 725,845	$ 894	$ (301,624)	$ 684,183	$ (5,447)	$ 347,839
BALANCE, shares at Dec. 31, 2022		89,396,000
BALANCE, shares at Dec. 31, 2022			(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		89,924,000
BALANCE, shares at Mar. 31, 2023			(22,446,000)
BALANCE at Dec. 31, 2023	$ 841,421	$ 903	$ (334,220)	694,798	(666)	480,606
BALANCE, shares at Dec. 31, 2023	90,270,306	90,270,000
BALANCE, shares at Dec. 31, 2023	(24,725,767)		(24,726,000)
Net income	$ 39,442					39,442
Foreign currency translation	(31)				(31)
Unrealized gain (loss) on investments, net of tax	(923)				(923)
Dividends to shareholders, per share $0.11	(7,426)					(7,426)
Treasury stock purchased	(6,769)		$ (6,769)
Treasury stock purchased, shares			(385,000)
Share-based compensation expense	2,307			2,307
Common stock issued	(1,915)	$ 6	$ (3,435)	1,514
Common stock issued, shares		637,000	(193,000)
BALANCE at Mar. 31, 2024	$ 866,106	$ 909	$ (344,424)	$ 698,619	$ (1,620)	$ 512,622
BALANCE, shares at Mar. 31, 2024	90,907,065	90,907,000
BALANCE, shares at Mar. 31, 2024	(25,304,436)		(25,304,000)