Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Deferred Compensation Trust [Member]	Retained Earnings [Member]
Beginning Balance at Dec. 31, 2022	$ 1,579,341	$ 26	$ 277,366	$ (5,248)	$ 1,307,197
Beginning Balance, Shares at Dec. 31, 2022		26,464,000
Stock compensation, including options and long-term incentives	2,225		2,225
Exercise of stock options less shares withheld for taxes	2,204		2,204
Exercise of stock options less shares withheld for taxes, Shares		21,000
Shares issued for long-term incentive awards, net of shares withheld for taxes, Shares		48,000
Shares issued for long-term incentive awards, net of shares withheld for taxes	(8,927)	$ 1	(8,928)
Purchase of shares by Deferred Compensation Trust			474	(474)
Sale of shares by Deferred Compensation Trust			(67)	67
Net Income (Loss)	76,097				76,097
Ending Balance at Mar. 31, 2023	1,650,940	$ 27	273,274	(5,655)	1,383,294
Ending Balance, Shares at Mar. 31, 2023		26,533,000
Beginning Balance at Dec. 31, 2022	1,579,341	$ 26	277,366	(5,248)	1,307,197
Beginning Balance, Shares at Dec. 31, 2022		26,464,000
Net Income (Loss)	265,629
Ending Balance at Sep. 30, 2023	1,849,463	$ 27	282,175	(5,565)	1,572,826
Ending Balance, Shares at Sep. 30, 2023		26,548
Beginning Balance at Mar. 31, 2023	1,650,940	$ 27	273,274	(5,655)	1,383,294
Beginning Balance, Shares at Mar. 31, 2023		26,533,000
Stock compensation, including options and long-term incentives	2,500		2,500
Director deferred share activity , Shares		2,000
Director deferred share activity	1,417		1,417
Exercise of stock options less shares withheld for taxes	46		46
Sale of shares by Deferred Compensation Trust			(29)	29
Net Income (Loss)	91,319				91,319
Ending Balance at Jun. 30, 2023	1,746,222	$ 27	277,208	(5,626)	1,474,613
Ending Balance, Shares at Jun. 30, 2023		26,535,000
Stock compensation, including options and long-term incentives	2,686		2,686
Exercise of stock options less shares withheld for taxes	2,541		2,541
Exercise of stock options less shares withheld for taxes, Shares		12
Shares issued for long-term incentive awards, net of shares withheld for taxes, Shares		1
Shares issued for long-term incentive awards, net of shares withheld for taxes	(199)		(199)
Sale of shares by Deferred Compensation Trust			(61)	61
Net Income (Loss)	98,213				98,213
Ending Balance at Sep. 30, 2023	1,849,463	$ 27	282,175	(5,565)	1,572,826
Ending Balance, Shares at Sep. 30, 2023		26,548
Beginning Balance at Dec. 31, 2023	1,941,494	$ 27	285,092	(5,679)	1,662,054
Beginning Balance, Shares at Dec. 31, 2023		26,549,000
Stock compensation, including options and long-term incentives	2,724		2,724
Exercise of stock options less shares withheld for taxes	1,993		1,993
Exercise of stock options less shares withheld for taxes, Shares		17,000
Shares issued for long-term incentive awards, net of shares withheld for taxes, Shares		22,000
Shares issued for long-term incentive awards, net of shares withheld for taxes	(7,968)		(7,968)
Purchase of shares by Deferred Compensation Trust			314	(314)
Sale of shares by Deferred Compensation Trust			(65)	65
Net Income (Loss)	90,695				90,695
Ending Balance at Mar. 31, 2024	2,028,938	$ 27	282,090	(5,928)	1,752,749
Ending Balance, Shares at Mar. 31, 2024		26,588,000
Beginning Balance at Dec. 31, 2023	1,941,494	$ 27	285,092	(5,679)	1,662,054
Beginning Balance, Shares at Dec. 31, 2023		26,549,000
Net Income (Loss)	285,962
Ending Balance at Sep. 30, 2024	2,231,485	$ 27	291,319	(7,877)	1,948,016
Ending Balance, Shares at Sep. 30, 2024		26,595,000
Beginning Balance at Mar. 31, 2024	2,028,938	$ 27	282,090	(5,928)	1,752,749
Beginning Balance, Shares at Mar. 31, 2024		26,588,000
Stock compensation, including options and long-term incentives	3,207		3,207
Director deferred share activity , Shares		2,000
Director deferred share activity	1,422		1,422
Purchase of shares by Deferred Compensation Trust			931	(931)
Sale of shares by Deferred Compensation Trust			(39)	39
Net Income (Loss)	102,519				102,519
Ending Balance at Jun. 30, 2024	2,136,086	$ 27	287,611	(6,820)	1,855,268
Ending Balance, Shares at Jun. 30, 2024		26,590,000
Stock compensation, including options and long-term incentives	3,463		3,463
Exercise of stock options less shares withheld for taxes	40		40
Shares issued for long-term incentive awards, net of shares withheld for taxes, Shares		5,000
Shares issued for long-term incentive awards, net of shares withheld for taxes	(852)		(852)
Purchase of shares by Deferred Compensation Trust			1,572	(1,572)
Sale of shares by Deferred Compensation Trust			(515)	515
Net Income (Loss)	92,748				92,748
Ending Balance at Sep. 30, 2024	$ 2,231,485	$ 27	$ 291,319	$ (7,877)	$ 1,948,016
Ending Balance, Shares at Sep. 30, 2024		26,595,000