Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common stock	Paid-in Capital	Accumulated Other Comprehensive Earnings (Loss)	Accumulated Other Comprehensive Earnings (Loss) Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Deferred Compensation	Treasury Stock at Cost
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2018	$ 806,842		$ 674	$ 305,660	$ (14,572)		$ 908,079		$ 8,354	$ (401,353)
Shares, Outstanding, Beginning Balance at Dec. 31, 2018			44,504,043
Increase Decrease In Stockholders Equity Roll Forward
Net earnings	191,642						191,642
Other comprehensive earnings (loss), net of tax	67,045				67,045
Deferred compensation									(374)	374
Share-based compensation	15,534		$ 4	15,530
Share-based compensation (in shares)			364,972
Dividends and dividend equivalents	(85,675)						(85,675)
Stockholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2019	$ 995,388	$ 1,095	$ 678	321,190	52,473	$ 22	1,014,046	$ 1,073	7,980	(400,979)
Shares, Outstanding, Ending Balance at Dec. 31, 2019			44,869,015
Accounting Standards Update [Extensible List]	ASU 2016-13
Increase Decrease In Stockholders Equity Roll Forward
Net earnings	$ 157,091						157,091
Other comprehensive earnings (loss), net of tax	56,219				56,219
Deferred compensation									312	(312)
Share-based compensation	14,178		$ 3	14,175
Share-based compensation (in shares)			273,565
Dividends and dividend equivalents	(87,993)						(87,993)
Stockholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2020	1,135,978		$ 681	335,365	108,714		1,084,217		8,292	(401,291)
Shares, Outstanding, Ending Balance at Dec. 31, 2020			45,142,580
Increase Decrease In Stockholders Equity Roll Forward
Net earnings	279,354						279,354
Other comprehensive earnings (loss), net of tax	(58,888)				(58,888)
Deferred compensation									1,350	(1,350)
Share-based compensation	8,378		$ 1	8,377
Share-based compensation (in shares)			146,757
Dividends and dividend equivalents	(135,461)						(135,461)
Stockholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2021	$ 1,229,361		$ 682	$ 343,742	$ 49,826		$ 1,228,110		$ 9,642	$ (402,641)
Shares, Outstanding, Ending Balance at Dec. 31, 2021			45,289,337