CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - UNAUDITED - USD ($) $ in Thousands	Total	Common Stock	Additional Contributed Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning Balance at Dec. 31, 2021	$ 463,578	$ 314,620	$ 42,549	$ 492,242	$ (4,525)	$ (381,308)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	20,239			20,239
Changes in fair market value of derivatives, net of tax	1,235				1,235
Changes in unrealized pension cost, net of tax	94				94
Cumulative translation adjustment, net of tax	(249)				(249)
Cash dividends	(1,284)			(1,284)
Acquired shares for treasury stock	(3,920)					(3,920)
Issued shares on vesting of restricted stock units	(1,413)	1,876	(3,289)
Stock compensation	1,898		1,898
Ending Balance at Mar. 31, 2022	480,178	316,496	41,158	511,197	(3,445)	(385,228)
Beginning Balance at Dec. 31, 2021	463,578	314,620	42,549	492,242	(4,525)	(381,308)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	44,635
Changes in fair market value of derivatives, net of tax	3,667
Changes in unrealized pension cost, net of tax	341
Cumulative translation adjustment, net of tax	(8,332)
Acquired shares for treasury stock	(13,446)
Ending Balance at Sep. 30, 2022	490,612	316,520	44,659	533,036	(8,849)	(394,754)
Beginning Balance at Mar. 31, 2022	480,178	316,496	41,158	511,197	(3,445)	(385,228)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	12,598			12,598
Changes in fair market value of derivatives, net of tax	705				705
Changes in unrealized pension cost, net of tax	2,082				2,082
Cumulative translation adjustment, net of tax	(2,012)				(2,012)
Cash dividends	(1,289)			(1,289)
Acquired shares for treasury stock	(7,748)					(7,748)
Issued shares on vesting of restricted stock units	(78)	6	(84)
Stock compensation	1,511		1,511
Ending Balance at Jun. 30, 2022	485,947	316,502	42,585	522,506	(2,670)	(392,976)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	11,798			11,798
Changes in fair market value of derivatives, net of tax	1,727				1,727
Changes in unrealized pension cost, net of tax	(1,835)				(1,835)
Cumulative translation adjustment, net of tax	(6,071)				(6,071)
Cash dividends	(1,268)			(1,268)
Acquired shares for treasury stock	(1,778)					(1,778)
Issued shares on vesting of restricted stock units	(12)	18	(30)
Stock compensation	2,104		2,104
Ending Balance at Sep. 30, 2022	490,612	316,520	44,659	533,036	(8,849)	(394,754)
Beginning Balance at Dec. 31, 2022	506,224	316,803	46,144	546,703	(671)	(402,755)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	18,344			18,344
Changes in fair market value of derivatives, net of tax	379				379
Changes in unrealized pension cost, net of tax	(34)				(34)
Cumulative translation adjustment, net of tax	1,024				1,024
Cash dividends	(1,260)			(1,260)
Acquired shares for treasury stock	(8,802)					(8,802)
Issued shares on vesting of restricted stock units	(3,143)	1,982	(5,125)
Stock compensation	1,404		1,404
Ending Balance at Mar. 31, 2023	514,136	318,785	42,423	563,787	698	(411,557)
Beginning Balance at Dec. 31, 2022	506,224	316,803	46,144	546,703	(671)	(402,755)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	45,212
Changes in fair market value of derivatives, net of tax	816
Changes in unrealized pension cost, net of tax	(7)
Cumulative translation adjustment, net of tax	(812)
Acquired shares for treasury stock	(25,890)
Ending Balance at Sep. 30, 2023	522,667	319,125	44,718	588,144	(675)	(428,645)
Beginning Balance at Mar. 31, 2023	514,136	318,785	42,423	563,787	698	(411,557)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	12,897			12,897
Changes in fair market value of derivatives, net of tax	830				830
Changes in unrealized pension cost, net of tax	4				4
Cumulative translation adjustment, net of tax	2,159				2,159
Cash dividends	(1,262)			(1,262)
Acquired shares for treasury stock	(8,760)					(8,760)
Issued shares on vesting of restricted stock units	(97)	326	(423)
Stock compensation	1,488		1,488
Ending Balance at Jun. 30, 2023	521,395	319,111	43,488	575,422	3,691	(420,317)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	13,971			13,971
Changes in fair market value of derivatives, net of tax	(392)				(392)
Changes in unrealized pension cost, net of tax	22				22
Cumulative translation adjustment, net of tax	(3,996)				(3,996)
Cash dividends	(1,249)			(1,249)
Acquired shares for treasury stock	(8,328)					(8,328)
Issued shares on vesting of restricted stock units	(9)	14	(23)
Stock compensation	1,253		1,253
Ending Balance at Sep. 30, 2023	$ 522,667	$ 319,125	$ 44,718	$ 588,144	$ (675)	$ (428,645)