Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common stock	Paid-in Capital	Accumulated Other Comprehensive Earnings (Loss)	Retained Earnings	Deferred Compensation	Treasury Stock at Cost
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2020	$ 1,135,978	$ 681	$ 335,365	$ 108,714	$ 1,084,217	$ 8,292	$ (401,291)
Shares, Outstanding, Beginning Balance at Dec. 31, 2020		45,142,580
Increase Decrease In Stockholders Equity Roll Forward
Net earnings	73,012				73,012
Other comprehensive earnings (loss), net of tax	(44,747)			(44,747)
Deferred compensation						(366)	366
Share-based compensation	1,392		1,392
Share-based compensation (in shares)		60,858
Dividends and dividend equivalents	(10,849)				(10,849)
Stockholders' Equity Attributable to Parent, Ending Balance at Mar. 31, 2021	1,154,786	$ 681	336,757	63,967	1,146,380	7,926	(400,925)
Stockholders' Equity Attributable to Parent, Ending Balance at Mar. 31, 2021		45,203,438
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2021	1,229,361	$ 682	343,742	49,826	1,228,110	9,642	(402,641)
Shares, Outstanding, Beginning Balance at Dec. 31, 2021		45,289,337
Increase Decrease In Stockholders Equity Roll Forward
Net earnings	47,923				47,923
Other comprehensive earnings (loss), net of tax	(115,581)			(115,581)
Deferred compensation						(973)	973
Share-based compensation	3,049		3,049
Share-based compensation (in shares)		26,605
Dividends and dividend equivalents	(11,330)				(11,330)
Stockholders' Equity Attributable to Parent, Ending Balance at Mar. 31, 2022	$ 1,153,422	$ 682	$ 346,791	$ (65,755)	$ 1,264,703	$ 8,669	$ (401,668)
Stockholders' Equity Attributable to Parent, Ending Balance at Mar. 31, 2022		45,315,942