Condensed 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, 2019	$ 995,388	$ 1,095	$ 678	$ 321,190	$ 52,473	$ 22	$ 1,014,046	$ 1,073	$ 7,980	$ (400,979)
Shares, Outstanding, Beginning 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 (loss)	$ (61,267)						(61,267)
Other comprehensive earnings (loss), net of tax	(13,031)				(13,031)
Deferred compensation									(1,010)	1,010
Share-based compensation	3,863		$ 1	3,862
Share-based compensation (in shares)			53,641
Dividends and dividend equivalents	(10,343)						(10,343)
Stockholders' Equity Attributable to Parent, Ending Balance at Mar. 31, 2020	915,705		$ 679	325,052	39,464		943,509		6,970	(399,969)
Shares, Outstanding, Ending Balance at Mar. 31, 2020			44,922,656
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 (loss)	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)
Shares, Outstanding, Ending Balance at Mar. 31, 2021			45,203,438