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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Balance   $ 187,925     $ 187,925  
Net earnings (loss) $ 3,820   $ (8,883)   5,145 $ (7,721)
Foreign currency translation adjustments 176   1,590   33 (968)
Pension liability adjustment, net of tax         365  
Balance 188,135       188,135  
Common Stock            
Balance 9,735 9,797 9,813 $ 9,873 9,797 9,873
Net earnings (loss) 0 0 0 0    
Foreign currency translation adjustments 0 0 0 0    
Pension liability adjustment, net of tax 0 0 0 0    
Cash dividends declared 0 0 0 0    
Share-based compensation expense 0 0 0 0    
Shares purchased and retired (21) (62)   (60)    
Balance 9,714 9,735 9,813 9,813 9,714 9,813
Capital in Excess of Par Value            
Balance 67,723 67,178 66,183 65,832 67,178 65,832
Net earnings (loss) 0 0 0 0    
Foreign currency translation adjustments 0 0 0 0    
Pension liability adjustment, net of tax 0 0 0 0    
Cash dividends declared 0 0 0 0    
Share-based compensation expense 327 545 350 351    
Shares purchased and retired 0 0   0    
Balance 68,050 67,723 66,533 66,183 68,050 66,533
Reinvested Earnings            
Balance 136,927 138,955 156,386 158,825 138,955 158,825
Net earnings (loss) 3,820 1,325 (8,883) 1,162    
Foreign currency translation adjustments 0 0 0 0    
Pension liability adjustment, net of tax 0 0 0 0    
Cash dividends declared (2,334) (2,336) (2,355) (2,357)    
Share-based compensation expense 0 0 0 0    
Shares purchased and retired (435) (1,017)   (1,244)    
Balance 137,978 136,927 145,148 156,386 137,978 145,148
Accumulated Other Comprehensive Loss            
Balance (27,965) (28,005) (26,956) (24,536) (28,005) (24,536)
Net earnings (loss) 0 0 0 0    
Foreign currency translation adjustments 176 (143) 1,590 (2,558)    
Pension liability adjustment, net of tax 182 183 144 138    
Cash dividends declared 0 0 0 0    
Share-based compensation expense 0 0 0 0    
Shares purchased and retired 0 0   0    
Balance $ (27,607) $ (27,965) $ (25,222) $ (26,956) $ (27,607) $ (25,222)