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, 2020	$ 261,160	$ 7,753	$ 204,875	$ 99,062	$ (50,515)	$ (15)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	20,902			20,902
Cash dividends	(11,576)			(11,576)
Issuance of common shares pursuant to stock-based compensation plan, net	(752)		(2,932)		2,180
Exercise of SARs	(123)		(415)		292
Stock-based compensation expense	2,585		2,585
Purchase of common shares	(18,975)				(18,975)
Other comprehensive income (loss)	(5,578)					(5,578)
Ending balance at Sep. 30, 2021	247,643	7,753	204,113	108,388	(67,018)	(5,593)
Beginning balance at Jun. 30, 2021	260,767	7,753	203,098	105,398	(53,437)	(2,045)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,805			6,805
Cash dividends	(3,815)			(3,815)
Issuance of common shares pursuant to stock-based compensation plan, net	83		(51)		134
Stock-based compensation expense	1,066		1,066
Purchase of common shares	(13,715)				(13,715)
Other comprehensive income (loss)	(3,548)					(3,548)
Ending balance at Sep. 30, 2021	247,643	7,753	204,113	108,388	(67,018)	(5,593)
Beginning balance at Dec. 31, 2021	245,798	7,753	204,276	112,220	(78,904)	453
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25,619			25,619
Cash dividends	(11,478)			(11,478)
Issuance of common shares pursuant to stock-based compensation plan, net	(467)		(2,803)		2,336
Exercise of SARs	(85)		(328)		243
Stock-based compensation expense	4,479		4,479
Purchase of common shares	(5,299)				(5,299)
Other comprehensive income (loss)	(66,832)					(66,832)
Ending balance at Sep. 30, 2022	191,735	7,753	205,624	126,361	(81,624)	(66,379)
Beginning balance at Jun. 30, 2022	205,614	7,753	204,482	121,386	(81,742)	(46,265)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,799			8,799
Cash dividends	(3,824)			(3,824)
Issuance of common shares pursuant to stock-based compensation plan, net	(47)		(165)		118
Stock-based compensation expense	1,307		1,307
Other comprehensive income (loss)	(20,114)					(20,114)
Ending balance at Sep. 30, 2022	$ 191,735	$ 7,753	$ 205,624	$ 126,361	$ (81,624)	$ (66,379)