Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Equity
Balance at beginning	$ 223,905
Net earnings	7,445	$ 4,053
Foreign currency translation adjustments	(306)	521
Pension liability adjustment, net of tax	99	154
Balance at ending	227,668
Common stock
Equity
Balance at beginning	9,584	9,709
Net earnings	0	0
Foreign currency translation adjustments	0	0
Pension liability adjustment, net of tax	0	0
Cash dividends declared	0	0
Stock options exercised, net of shares withheld for employee taxes and strike price	1	0
Share-based compensation expense	0	0
Shares purchased and retired	(62)	(75)
Balance at ending	9,523	9,634
Capital in excess of par value
Equity
Balance at beginning	70,475	68,718
Net earnings	0	0
Foreign currency translation adjustments	0	0
Pension liability adjustment, net of tax	0	0
Cash dividends declared	0	0
Stock options exercised, net of shares withheld for employee taxes and strike price	15	8
Share-based compensation expense	338	350
Shares purchased and retired	0	0
Balance at ending	70,828	69,076
Reinvested earnings
Equity
Balance at beginning	164,039	147,762
Net earnings	7,445	4,053
Foreign currency translation adjustments	0	0
Pension liability adjustment, net of tax	0	0
Cash dividends declared	(2,289)	(2,316)
Stock options exercised, net of shares withheld for employee taxes and strike price	0	0
Share-based compensation expense	0	0
Shares purchased and retired	(1,478)	(1,722)
Balance at ending	167,717	147,777
Accumulated other comprehensive loss
Equity
Balance at beginning	(20,193)	(24,794)
Net earnings		0
Foreign currency translation adjustments	(306)	521
Pension liability adjustment, net of tax	(99)	(154)
Cash dividends declared		0
Stock options exercised, net of shares withheld for employee taxes and strike price		0
Share-based compensation expense		0
Shares purchased and retired		0
Balance at ending	$ (20,400)	$ (24,119)