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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Balance $ 201,395  
Net earnings 4,053 $ 1,325
Foreign currency translation adjustments 521 (143)
Pension liability adjustment, net of tax 154 183
Balance 202,368  
Common Stock    
Balance 9,709 9,797
Net earnings 0 0
Foreign currency translation adjustments 0 0
Pension liability adjustment, net of tax 0 0
Cash dividends declared 0 0
Stock option exercised 0  
Share-based compensation expense 0 0
Shares purchased and retired (75) (62)
Balance 9,634 9,735
Capital in Excess of Par Value    
Balance 68,718 67,178
Net earnings 0 0
Foreign currency translation adjustments 0 0
Pension liability adjustment, net of tax 0 0
Cash dividends declared 0 0
Stock option exercised 8  
Share-based compensation expense 350 545
Shares purchased and retired 0 0
Balance 69,076 67,723
Reinvested Earnings    
Balance 147,762 138,955
Net earnings 4,053 1,325
Foreign currency translation adjustments 0 0
Pension liability adjustment, net of tax 0 0
Cash dividends declared (2,316) (2,336)
Stock option exercised 0  
Share-based compensation expense 0 0
Shares purchased and retired (1,722) (1,017)
Balance 147,777 136,927
Accumulated Other Comprehensive Loss    
Balance (24,794) (28,005)
Net earnings 0 0
Foreign currency translation adjustments 521 (143)
Pension liability adjustment, net of tax 154 183
Cash dividends declared 0 0
Stock option exercised 0  
Share-based compensation expense 0 0
Shares purchased and retired 0 0
Balance $ (24,119) $ (27,965)