Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common stock	Paid-in Capital	Accumulated Other Comprehensive Earnings (Loss)	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Deferred Compensation	Treasury Stock at Cost	Cumulative Effect, Period of Adoption, Adjustment	Total
Shareholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2021	$ 1,364	$ 343,060	$ 49,826		$ 1,228,110	$ 9,642	$ (402,641)		$ 1,229,361
Shares, Outstanding, Beginning Balance at Dec. 31, 2021	90,578,674
Increase Decrease In Shareholders Equity Roll Forward
Net Income (Loss)					583,411				583,411
Other comprehensive earnings (loss), net of tax			(278,902)						(278,902)
Deferred compensation						2,373	(2,373)
Share-based compensation	$ 4	8,647							8,651
Share-based compensation (in shares)	360,830
Dividends and dividend equivalents					(365,180)				(365,180)
Shareholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2022	$ 1,368	351,707	(229,076)	$ (951)	1,446,341	12,015	(405,014)	$ (951)	1,177,341
Shares, Outstanding, Ending Balance at Dec. 31, 2022	90,939,504
Increase Decrease In Shareholders Equity Roll Forward
Net Income (Loss)					304,611				304,611
Other comprehensive earnings (loss), net of tax			62,773						62,773
Deferred compensation						1,524	(1,524)
Share-based compensation	$ 3	9,953							9,956
Share-based compensation (in shares)	340,590
Dividends and dividend equivalents					(140,216)				(140,216)
Shareholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2023	$ 1,371	361,660	(166,303)		1,609,785	13,539	(406,538)		1,413,514
Shares, Outstanding, Ending Balance at Dec. 31, 2023	91,280,094
Increase Decrease In Shareholders Equity Roll Forward
Net Income (Loss)					345,779				345,779
Other comprehensive earnings (loss), net of tax			(7,420)						(7,420)
Deferred compensation						(41)	41
Share-based compensation	$ 5	5,985							5,990
Share-based compensation (in shares)	458,038
Dividends and dividend equivalents					(235,896)				(235,896)
Shareholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2024	$ 1,376	$ 367,645	$ (173,723)		$ 1,719,668	$ 13,498	$ (406,497)		$ 1,521,967
Shares, Outstanding, Ending Balance at Dec. 31, 2024	91,738,132