Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Deferred Compensation Trust [Member]	Retained Earnings [Member]
Beginning Balance at Dec. 31, 2021	$ 1,220,333	$ 26	$ 274,633	$ (4,101)	$ 949,775
Beginning Balance, Shares at Dec. 31, 2021		26,337
Stock compensation, including options and long-term incentives	2,056		2,056
Exercise of stock options less shares withheld for taxes	907		907
Exercise of stock options less shares withheld for taxes, Shares		10
Shares issued for long-term incentive awards, net of shares withheld for taxes, Shares		61
Shares issued for long-term incentive awards, net of shares withheld for taxes	(11,230)		(11,230)
Purchase of shares by Deferred Compensation Trust			2,445	(2,445)
Sale of shares by Deferred Compensation Trust			(1,066)	1,066
Net income	79,424				79,424
Ending Balance at Mar. 31, 2022	1,291,490	$ 26	267,745	(5,480)	1,029,199
Ending Balance, Shares at Mar. 31, 2022		26,408
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
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
Shares issued for long-term incentive awards, net of shares withheld for taxes, Shares		48
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	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