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, 2023	$ 37,184	$ 1,341,273	$ 2,446,925	$ (2,719,588)	$ 2,082	$ 1,107,876
Net income			211,680			211,680
Dividends paid			(19,594)			(19,594)
Stock awards and exercise of stock options	211	121,675		(39,809)		82,077
Purchases of treasury stock				(145,933)		(145,933)
Other		(379)		(100)	128	(351)
Balance at Sep. 30, 2024	37,395	1,462,569	2,639,011	(2,905,430)	2,210	1,235,755
Balance at Jun. 30, 2024	37,313	1,416,166	2,570,722	(2,819,053)	2,149	1,207,297
Net income			75,776			75,776
Dividends paid			(7,487)			(7,487)
Stock awards and exercise of stock options	82	46,008		(28,523)		17,567
Purchases of treasury stock				(57,820)		(57,820)
Other		395		(34)	61	422
Balance at Sep. 30, 2024	37,395	1,462,569	2,639,011	(2,905,430)	2,210	1,235,755
Balance at Dec. 31, 2024	37,422	1,484,176	2,721,832	(3,126,660)	2,223	1,118,993
Net income			188,487			188,487
Dividends paid			(23,196)			(23,196)
Stock awards and exercise of stock options	171	95,976		(49,675)		46,472
Purchases of treasury stock				(253,477)		(253,477)
Excise tax on share repurchase				(1,544)		(1,544)
Other		915		(119)	152	948
Balance at Sep. 30, 2025	37,593	1,581,067	2,887,123	(3,431,475)	2,375	1,076,683
Balance at Jun. 30, 2025	37,593	1,576,165	2,831,540	(3,249,115)	2,302	1,198,485
Net income			64,237			64,237
Dividends paid			(8,654)			(8,654)
Stock awards and exercise of stock options		5,101				5,101
Purchases of treasury stock				(180,776)		(180,776)
Excise tax on share repurchase				(1,544)		(1,544)
Other		(199)		(40)	73	(166)
Balance at Sep. 30, 2025	$ 37,593	$ 1,581,067	$ 2,887,123	$ (3,431,475)	$ 2,375	$ 1,076,683