Consolidated Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands	Capital Stock [Member]	Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock-At Cost [Member]	Deferred Compensation Payable In Company Stock [Member]	Total
Balance at Dec. 31, 2022	$ 36,796	$ 1,149,899	$ 2,197,918	$ (2,588,145)	$ 2,247	$ 798,715
Net income			54,121			54,121
Dividends paid			(5,685)			(5,685)
Stock awards and exercise of stock options	88	36,338		(3,406)		33,020
Other		(118)		(37)	37	(118)
Balance at Mar. 31, 2023	36,884	1,186,119	2,246,354	(2,591,588)	2,284	880,053
Balance at Dec. 31, 2023	37,184	1,341,273	2,446,925	(2,719,588)	2,082	1,107,876
Net income			65,017			65,017
Dividends paid			(6,050)			(6,050)
Stock awards and exercise of stock options	113	58,112		(8,577)		49,648
Purchases of treasury stock				(32,344)		(32,344)
Other		(652)		(34)	34	(652)
Balance at Mar. 31, 2024	$ 37,297	$ 1,398,733	$ 2,505,892	$ (2,760,543)	$ 2,116	$ 1,183,495