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	14,255			14,255
Cash dividends	(7,941)			(7,941)
Issuance of common shares pursuant to stock-based compensation plan, net	(786)		(3,327)		2,541
Exercise of SARs	(116)		(238)		122
Stock-based compensation expense	2,859		2,877
Purchase of common shares	(2,377)				(2,377)
Other comprehensive income (loss)	2,927					2,927
Ending balance at Jun. 30, 2023	215,146	7,753	206,734	137,996	(80,943)	(56,394)
Beginning balance at Mar. 31, 2023	217,500	7,753	206,614	134,822	(79,419)	(52,270)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,138			7,138
Cash dividends	(3,964)			(3,964)
Issuance of common shares pursuant to stock-based compensation plan, net	64		(807)		871
Stock-based compensation expense	909		927
Purchase of common shares	(2,377)				(2,377)
Other comprehensive income (loss)	(4,124)					(4,124)
Ending balance at Jun. 30, 2023	215,146	7,753	206,734	137,996	(80,943)	(56,394)
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	11,636			11,636
Cash dividends	(8,182)			(8,182)
Issuance of common shares pursuant to stock-based compensation plan, net	(1,815)		(5,611)		3,796
Stock-based compensation expense	1,700		1,732
Purchase of common shares	(1,054)				(1,054)
Other comprehensive income (loss)	(2,169)					(2,169)
Ending balance at Jun. 30, 2024	229,925	7,753	204,128	149,236	(81,554)	(49,638)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted Stock Award, Forfeitures					(32)
Beginning balance at Mar. 31, 2024	229,487	7,753	204,361	148,845	(82,316)	(49,156)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,484			4,484
Cash dividends	(4,093)			(4,093)
Issuance of common shares pursuant to stock-based compensation plan, net	55		(707)		762
Stock-based compensation expense	474		474
Other comprehensive income (loss)	(482)					(482)
Ending balance at Jun. 30, 2024	$ 229,925	$ 7,753	$ 204,128	$ 149,236	(81,554)	$ (49,638)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted Stock Award, Forfeitures					$ 0