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] Cumulative Effect of Adoption Adjustment	Retained Earnings [Member]	Treasury stock, common	Cumulative Effect of Adoption Adjustment	Total
Beginning Balance at Dec. 31, 2019	$ 531	$ 270,923			$ 1,341,344	$ (169,365)		$ 1,443,433
Beginning Balance, shares at Dec. 31, 2019	53,054
Beginning Balance, treasury shares at Dec. 31, 2019						4,949
Comprehensive income					257,196			257,196
Common stock purchased for treasury						$ (129,045)		(129,045)
Common stock acquired, shares						1,602
Restricted shares forfeited, shares						15
Share-based compensation	$ 1	10,662				$ (4,969)		5,694
Share-based compensation, shares	167					62
Exercise of stock options	$ 1	882						883
Exercise of stock options, shares	56
Ending Balance (ASU 2016-13) at Dec. 31, 2020				$ (3,832)			$ (3,832)
Ending Balance at Dec. 31, 2020	$ 533	282,467			1,594,708	$ (303,379)		1,574,329
Ending Balance, shares at Dec. 31, 2020	53,277
Ending Balance, treasury shares at Dec. 31, 2020						6,628
Comprehensive income					260,344			260,344
Common stock purchased for treasury						$ (797,838)		(797,838)
Common stock acquired, shares						9,199
Restricted shares forfeited, shares						32
Share-based compensation	$ 1	11,525				$ (5,994)		5,532
Share-based compensation, shares	184					56
Exercise of stock options	$ 2	2,678						2,680
Exercise of stock options, shares	176
Ending Balance at Dec. 31, 2021	$ 536	296,670			1,855,052	$ (1,107,211)		$ 1,045,047
Ending Balance, shares at Dec. 31, 2021	53,637
Ending Balance, treasury shares at Dec. 31, 2021						15,915		15,915
Comprehensive income			$ (533)		184,675			$ 184,142
Common stock purchased for treasury						$ (599,587)		(599,587)
Common stock acquired, shares						6,795
Restricted shares forfeited, shares						10
Share-based compensation	$ 2	12,640				$ (4,625)		8,017
Share-based compensation, shares	193					52
Ending Balance at Dec. 31, 2022	$ 538	$ 309,310	$ (533)		$ 2,039,727	$ (1,711,423)		$ 637,619
Ending Balance, shares at Dec. 31, 2022	53,830
Ending Balance, treasury shares at Dec. 31, 2022						22,772		22,772