Consolidated Statement of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury stock, common	Total
Beginning Balance at Dec. 31, 2021	$ 536	$ 296,670		$ 1,855,052	$ (1,107,211)	$ 1,045,047
Beginning Balance ( In Shares) at Dec. 31, 2021	53,637
Beginning Balance, treasury shares at Dec. 31, 2021					15,915
Comprehensive income			$ (323)	58,078		57,755
Common stock purchased for treasury					$ (394,930)	(394,930)
Common stock acquired, shares					4,575
Restricted shares forfeited, shares					6
Share-based compensation	$ 2	3,188			$ (4,625)	(1,435)
Share-based compensation, shares	189				52
Ending Balance at Mar. 31, 2022	$ 538	299,858	(323)	1,913,130	$ (1,506,766)	706,437
Ending Balance ( In shares ) at Mar. 31, 2022	53,826
Ending Balance, treasury shares at Mar. 31, 2022					20,548
Beginning Balance at Dec. 31, 2021	$ 536	296,670		1,855,052	$ (1,107,211)	1,045,047
Beginning Balance ( In Shares) at Dec. 31, 2021	53,637
Beginning Balance, treasury shares at Dec. 31, 2021					15,915
Comprehensive income						83,242
Ending Balance at Jun. 30, 2022	$ 538	303,029	(398)	1,938,692	$ (1,635,223)	606,638
Ending Balance ( In shares ) at Jun. 30, 2022	53,830
Ending Balance, treasury shares at Jun. 30, 2022					21,867
Beginning Balance at Mar. 31, 2022	$ 538	299,858	(323)	1,913,130	$ (1,506,766)	706,437
Beginning Balance ( In Shares) at Mar. 31, 2022	53,826
Beginning Balance, treasury shares at Mar. 31, 2022					20,548
Comprehensive income			(75)	25,562		25,487
Common stock purchased for treasury					$ (128,457)	(128,457)
Common stock acquired, shares					1,319
Share-based compensation		3,171				3,171
Share-based compensation, shares	4
Ending Balance at Jun. 30, 2022	$ 538	303,029	(398)	1,938,692	$ (1,635,223)	606,638
Ending Balance ( In shares ) at Jun. 30, 2022	53,830
Ending Balance, treasury shares at Jun. 30, 2022					21,867
Beginning Balance at Dec. 31, 2022	$ 538	309,310	(533)	2,039,727	$ (1,711,423)	$ 637,619
Beginning Balance ( In Shares) at Dec. 31, 2022	53,830
Beginning Balance, treasury shares at Dec. 31, 2022					22,772	22,772
Comprehensive income			119	59,564		$ 59,683
Common stock purchased for treasury					$ (35,090)	(35,090)
Common stock acquired, shares					310
Restricted shares forfeited, shares					5
Share-based compensation	$ 2	3,367			$ (6,331)	(2,962)
Share-based compensation, shares	136				56
Ending Balance at Mar. 31, 2023	$ 540	312,677	(414)	2,099,291	$ (1,752,844)	659,250
Ending Balance ( In shares ) at Mar. 31, 2023	53,966
Ending Balance, treasury shares at Mar. 31, 2023					23,143
Beginning Balance at Dec. 31, 2022	$ 538	309,310	(533)	2,039,727	$ (1,711,423)	$ 637,619
Beginning Balance ( In Shares) at Dec. 31, 2022	53,830
Beginning Balance, treasury shares at Dec. 31, 2022					22,772	22,772
Comprehensive income						$ 88,380
Ending Balance at Jun. 30, 2023	$ 540	315,930	(690)	2,128,264	$ (1,798,619)	$ 645,425
Ending Balance ( In shares ) at Jun. 30, 2023	53,970
Ending Balance, treasury shares at Jun. 30, 2023					23,572	23,572
Beginning Balance at Mar. 31, 2023	$ 540	312,677	(414)	2,099,291	$ (1,752,844)	$ 659,250
Beginning Balance ( In Shares) at Mar. 31, 2023	53,966
Beginning Balance, treasury shares at Mar. 31, 2023					23,143
Comprehensive income			(276)	28,973		28,697
Common stock purchased for treasury					$ (45,775)	(45,775)
Common stock acquired, shares					419
Restricted shares forfeited, shares					10
Share-based compensation		3,253				3,253
Share-based compensation, shares	4
Ending Balance at Jun. 30, 2023	$ 540	$ 315,930	$ (690)	$ 2,128,264	$ (1,798,619)	$ 645,425
Ending Balance ( In shares ) at Jun. 30, 2023	53,970
Ending Balance, treasury shares at Jun. 30, 2023					23,572	23,572