CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Preferred Stock Series A Nonconvertible Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
BALANCE at Dec. 31, 2022	$ 1,275,369	$ 2	$ 491	$ 681,335	$ 653,277	$ (18,452)	$ (41,284)
BALANCE (in shares) at Dec. 31, 2022		200,000	49,136,030				1,365,648
Net income	39,839				39,839
Other comprehensive income	2,975					2,975
Cash dividend	(16,769)				(16,769)
Issuance of common stock to employees	3,854		$ 1	3,853
Issuance of common stock to employees (in shares)			126,846
Shares withheld for employee taxes	(7,181)			(7,181)
Shares withheld for employee taxes (in shares)			(51,703)
Cancellation of restricted stock awards			$ (5)	5
Cancellation of restricted stock awards (in shares)			(526,241)
Issuance of common stock to Board of Directors and Scientific Advisory Board	723			723
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)			6,896
Issuance of common stock to employees under an ESPP	655			655
Issuance of common stock to employees under an ESPP (in shares)			5,639
BALANCE at Mar. 31, 2023	1,299,465	$ 2	$ 487	679,390	676,347	(15,477)	$ (41,284)
BALANCE (in shares) at Mar. 31, 2023		200,000	48,697,467				1,365,648
BALANCE at Dec. 31, 2023	1,447,226	$ 2	$ 487	699,554	789,553	(1,086)	$ (41,284)
BALANCE (in shares) at Dec. 31, 2023		200,000	48,731,026				1,365,648
Net income	56,853				56,853
Other comprehensive income	(2,708)					(2,708)
Cash dividend	(19,527)				(19,527)
Issuance of common stock to employees	8,553		$ 1	8,552
Issuance of common stock to employees (in shares)			103,752
Shares withheld for employee taxes	(7,058)			(7,058)
Shares withheld for employee taxes (in shares)			(39,829)
Issuance of common stock to Board of Directors and Scientific Advisory Board	758			758
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)			5,552
Issuance of common stock to employees under an ESPP	803			803
Issuance of common stock to employees under an ESPP (in shares)			4,463
BALANCE at Mar. 31, 2024	$ 1,484,900	$ 2	$ 488	$ 702,609	$ 826,879	$ (3,794)	$ (41,284)
BALANCE (in shares) at Mar. 31, 2024		200,000	48,804,964				1,365,648