CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2022	$ 206,325	$ 7,753	$ 207,422	$ 131,682	$ (81,211)	$ (59,321)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,649			21,649
Cash dividends	(11,887)			(11,887)
Issuance of common shares pursuant to stock-based compensation plan, net	(721)		(3,336)		2,615
Exercise of SARs	(116)		(238)		122
Stock-based compensation expense	3,797		3,815
Purchase of common shares	(5,212)				(5,212)
Other comprehensive income (loss)	(7,599)					(7,599)
Ending balance at Sep. 30, 2023	206,236	7,753	207,663	141,444	(83,704)	(66,920)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted Stock Award, Forfeitures					(18)
Beginning balance at Jun. 30, 2023	215,146	7,753	206,734	137,996	(80,943)	(56,394)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,394			7,394
Cash dividends	(3,946)			(3,946)
Issuance of common shares pursuant to stock-based compensation plan, net	65		(9)		74
Stock-based compensation expense	938		938
Purchase of common shares	(2,835)				(2,835)
Other comprehensive income (loss)	(10,526)					(10,526)
Ending balance at Sep. 30, 2023	206,236	7,753	207,663	141,444	(83,704)	(66,920)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted Stock Award, Forfeitures					0
Beginning balance at Dec. 31, 2023	229,809	7,753	208,007	145,782	(84,264)	(47,469)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	14,574			14,574
Cash dividends	(12,264)			(12,264)
Issuance of common shares pursuant to stock-based compensation plan, net	(1,749)		(5,611)		3,862
Stock-based compensation expense	2,598		2,630
Purchase of common shares	(3,705)				(3,705)
Other comprehensive income (loss)	8,384					8,384
Ending balance at Sep. 30, 2024	237,647	7,753	205,026	148,092	(84,139)	(39,085)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted Stock Award, Forfeitures					(32)
Beginning balance at Jun. 30, 2024	229,925	7,753	204,128	149,236	(81,554)	(49,638)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,938			2,938
Cash dividends	(4,082)			(4,082)
Issuance of common shares pursuant to stock-based compensation plan, net	66		0		66
Stock-based compensation expense	898		898
Purchase of common shares	(2,651)				(2,651)
Other comprehensive income (loss)	10,553					10,553
Ending balance at Sep. 30, 2024	$ 237,647	$ 7,753	$ 205,026	$ 148,092	(84,139)	$ (39,085)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted Stock Award, Forfeitures					$ 0