CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Total
BALANCE at Dec. 31, 2022	$ 411	$ (187,212)	$ 332,080	$ 854,644	$ 999,923
BALANCE (in shares) at Dec. 31, 2022	41,123,365
BALANCE (in shares) at Dec. 31, 2022		(5,362,224)
Increase (Decrease) in Stockholders' Equity
Net income				57,216	57,216
Issuance of Stock:
Issuance of shares for options exercised		$ 36	(18)		18
Issuance of shares for options exercised (in shares)		1,000
Issuance of restricted stock & performance stock		$ 1,131	3,384		4,515
Issuance of restricted stock & performance stock (in shares)		31,960
Shares received in lieu of tax withholding on vested stock		$ (1,798)			(1,798)
Shares received in lieu of tax withholding on vested stock (in shares)		(12,728)
Stock-based compensation			3,438		3,438
Dividends				(6,254)	(6,254)
Share repurchase		$ (3,568)			(3,568)
Share repurchase (in shares)		(29,400)
BALANCE at Mar. 31, 2023	$ 411	$ (191,411)	338,884	905,606	1,053,490
BALANCE (in shares) at Mar. 31, 2023	41,123,365
BALANCE (in shares) at Mar. 31, 2023		(5,371,392)
BALANCE at Dec. 31, 2022	$ 411	$ (187,212)	332,080	854,644	999,923
BALANCE (in shares) at Dec. 31, 2022	41,123,365
BALANCE (in shares) at Dec. 31, 2022		(5,362,224)
Increase (Decrease) in Stockholders' Equity
Net income					231,817
BALANCE at Sep. 30, 2023	$ 411	$ (197,085)	338,830	1,065,006	1,207,162
BALANCE (in shares) at Sep. 30, 2023	41,123,365
BALANCE (in shares) at Sep. 30, 2023		(5,363,300)
BALANCE at Mar. 31, 2023	$ 411	$ (191,411)	338,884	905,606	1,053,490
BALANCE (in shares) at Mar. 31, 2023	41,123,365
BALANCE (in shares) at Mar. 31, 2023		(5,371,392)
Increase (Decrease) in Stockholders' Equity
Net income				69,476	69,476
Issuance of Stock:
Issuance of restricted stock & performance stock		$ 2,220	(2,220)
Issuance of restricted stock & performance stock (in shares)		61,505
Shares received in lieu of tax withholding on vested stock		$ (2,891)			(2,891)
Shares received in lieu of tax withholding on vested stock (in shares)		(19,739)
Stock-based compensation			1,749		1,749
Dividends				(7,152)	(7,152)
Share repurchase		$ (3,208)			(3,208)
Share repurchase (in shares)		(24,000)
BALANCE at Jun. 30, 2023	$ 411	$ (195,290)	338,413	967,930	1,111,464
BALANCE (in shares) at Jun. 30, 2023	41,123,365
BALANCE (in shares) at Jun. 30, 2023		(5,353,626)
Increase (Decrease) in Stockholders' Equity
Net income				105,125	105,125
Issuance of Stock:
Issuance of restricted stock & performance stock		$ 28	(28)
Issuance of restricted stock & performance stock (in shares)		761
Shares received in lieu of tax withholding on vested stock		$ (36)			(36)
Shares received in lieu of tax withholding on vested stock (in shares)		(185)
Stock-based compensation			445		445
Dividends				(8,049)	(8,049)
Share repurchase		$ (1,787)			(1,787)
Share repurchase (in shares)		(10,250)
BALANCE at Sep. 30, 2023	$ 411	$ (197,085)	338,830	1,065,006	1,207,162
BALANCE (in shares) at Sep. 30, 2023	41,123,365
BALANCE (in shares) at Sep. 30, 2023		(5,363,300)
BALANCE at Dec. 31, 2023	$ 411	$ (209,807)	339,562	1,147,663	$ 1,277,829
BALANCE (in shares) at Dec. 31, 2023	41,123,365				41,123,365
BALANCE (in shares) at Dec. 31, 2023		(5,438,625)			5,438,625
Increase (Decrease) in Stockholders' Equity
Net income				96,319	$ 96,319
Issuance of Stock:
Issuance of shares for options exercised		$ 53	(26)		27
Issuance of shares for options exercised (in shares)		1,369
Issuance of restricted stock & performance stock		$ 657	4,696		5,353
Issuance of restricted stock & performance stock (in shares)		17,018
Shares received in lieu of tax withholding on vested stock		$ (2,126)			(2,126)
Shares received in lieu of tax withholding on vested stock (in shares)		(6,763)
Stock-based compensation			4,350		4,350
Dividends				(8,921)	(8,921)
Share repurchase		$ (295)			(295)
Share repurchase (in shares)		(1,500)
BALANCE at Mar. 31, 2024	$ 411	$ (211,518)	348,582	1,235,061	1,372,536
BALANCE (in shares) at Mar. 31, 2024	41,123,365
BALANCE (in shares) at Mar. 31, 2024		(5,428,501)
BALANCE at Dec. 31, 2023	$ 411	$ (209,807)	339,562	1,147,663	$ 1,277,829
BALANCE (in shares) at Dec. 31, 2023	41,123,365				41,123,365
BALANCE (in shares) at Dec. 31, 2023		(5,438,625)			5,438,625
Increase (Decrease) in Stockholders' Equity
Net income					$ 376,563
BALANCE at Sep. 30, 2024	$ 411	$ (256,775)	350,182	1,493,904	$ 1,587,722
BALANCE (in shares) at Sep. 30, 2024	41,123,365				41,123,365
BALANCE (in shares) at Sep. 30, 2024		(5,530,807)			5,530,807
BALANCE at Mar. 31, 2024	$ 411	$ (211,518)	348,582	1,235,061	$ 1,372,536
BALANCE (in shares) at Mar. 31, 2024	41,123,365
BALANCE (in shares) at Mar. 31, 2024		(5,428,501)
Increase (Decrease) in Stockholders' Equity
Net income				134,009	134,009
Issuance of Stock:
Issuance of restricted stock & performance stock		$ 1,851	(1,851)
Issuance of restricted stock & performance stock (in shares)		47,344
Shares received in lieu of tax withholding on vested stock		$ (5,062)			(5,062)
Shares received in lieu of tax withholding on vested stock (in shares)		(15,817)
Stock-based compensation			2,368		2,368
Dividends				(10,713)	(10,713)
Share repurchase		$ (10,844)			(10,844)
Share repurchase (in shares)		(34,997)
BALANCE at Jun. 30, 2024	$ 411	$ (225,573)	349,099	1,358,357	1,482,294
BALANCE (in shares) at Jun. 30, 2024	41,123,365
BALANCE (in shares) at Jun. 30, 2024		(5,431,971)
Increase (Decrease) in Stockholders' Equity
Net income				146,235	146,235
Issuance of Stock:
Issuance of restricted stock & performance stock		$ 66	(66)
Issuance of restricted stock & performance stock (in shares)		1,434
Shares received in lieu of tax withholding on vested stock		$ (104)			(104)
Shares received in lieu of tax withholding on vested stock (in shares)		(309)
Stock-based compensation			1,149		1,149
Dividends				(10,688)	(10,688)
Share repurchase		$ (31,164)			(31,164)
Share repurchase (in shares)		(99,961)
BALANCE at Sep. 30, 2024	$ 411	$ (256,775)	$ 350,182	$ 1,493,904	$ 1,587,722
BALANCE (in shares) at Sep. 30, 2024	41,123,365				41,123,365
BALANCE (in shares) at Sep. 30, 2024		(5,530,807)			5,530,807