Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Deferred Compensation Trust [Member]	Retained Earnings [Member]
Beginning Balance at Dec. 31, 2020	$ 961,288	$ 26	$ 267,666	$ (2,944)	$ 696,540
Beginning Balance, Shares at Dec. 31, 2020		26,236,000
Stock compensation, including options and long-term incentives	7,245		7,245
Director deferred share activity	1,458		1,458
Director deferred share activity , Shares		2,000
Exercise of stock options less shares withheld for taxes	3,678		3,678
Exercise of stock options less shares withheld for taxes, Shares		47,000
Shares issued for long-term incentive awards, net of shares withheld for taxes, Shares		52,000
Shares issued for long-term incentive awards, net of shares withheld for taxes	(6,571)		(6,571)
Purchase of shares by Deferred Compensation Trust			1,268	(1,268)
Sale of shares by Deferred Compensation Trust			(111)	111
Net Income (Loss)	253,235				253,235
Ending Balance at Dec. 31, 2021	1,220,333	$ 26	274,633	(4,101)	949,775
Ending Balance, Shares at Dec. 31, 2021		26,337,000
Stock compensation, including options and long-term incentives	7,657		7,657
Director deferred share activity	1,170		1,170
Director deferred share activity , Shares		2,000
Exercise of stock options less shares withheld for taxes	4,511		4,511
Exercise of stock options less shares withheld for taxes, Shares		62,000
Shares issued for long-term incentive awards, net of shares withheld for taxes, Shares		63,000
Shares issued for long-term incentive awards, net of shares withheld for taxes	(11,752)		(11,752)
Purchase of shares by Deferred Compensation Trust			3,254	(3,254)
Sale of shares by Deferred Compensation Trust			(2,107)	2,107
Net Income (Loss)	357,422				357,422
Ending Balance at Dec. 31, 2022	1,579,341	$ 26	277,366	(5,248)	1,307,197
Ending Balance, Shares at Dec. 31, 2022		26,464,000
Stock compensation, including options and long-term incentives	10,219		10,219
Director deferred share activity	1,417		1,417
Director deferred share activity , Shares		2,000
Exercise of stock options less shares withheld for taxes	$ 4,875		4,875
Exercise of stock options less shares withheld for taxes, Shares	34,881	35,000
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	$ (9,215)	$ (1)	(9,216)
Purchase of shares by Deferred Compensation Trust			620	(620)
Sale of shares by Deferred Compensation Trust			(189)	189
Net Income (Loss)	354,857				354,857
Ending Balance at Dec. 31, 2023	$ 1,941,494	$ 27	$ 285,092	$ (5,679)	$ 1,662,054
Ending Balance, Shares at Dec. 31, 2023		26,549,000