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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Balance     $ 187,925       $ 187,925  
Net earnings (loss) $ 5,069     $ (5,869)     10,214 $ (13,590)
Foreign currency translation adjustments (601)     751     (568) (217)
Pension liability adjustment, net of tax             548  
Balance 190,783           190,783  
Common Stock                
Balance 9,714 $ 9,735 9,797 9,813 $ 9,813 $ 9,873 9,797 9,873
Net earnings (loss) 0 0 0 0 0 0    
Foreign currency translation adjustments 0 0 0 0 0 0    
Pension liability adjustment, net of tax 0 0 0 0 0 0    
Cash dividends declared 0 0 0 0 0 0    
Issuance of restricted stock 36     31        
Share-based compensation expense 0 0 0 0 0 0    
Shares purchased and retired   (21) (62)     (60)    
Balance 9,750 9,714 9,735 9,844 9,813 9,813 9,750 9,844
Capital in Excess of Par Value                
Balance 68,050 67,723 67,178 66,533 66,183 65,832 67,178 65,832
Net earnings (loss) 0 0 0 0 0 0    
Foreign currency translation adjustments 0 0 0 0 0 0    
Pension liability adjustment, net of tax 0 0 0 0 0 0    
Cash dividends declared 0 0 0 0 0 0    
Issuance of restricted stock (36)     (31)        
Share-based compensation expense 338 327 545 362 350 351    
Shares purchased and retired   0 0     0    
Balance 68,352 68,050 67,723 66,864 66,533 66,183 68,352 66,864
Reinvested Earnings                
Balance 137,978 136,927 138,955 145,148 156,386 158,825 138,955 158,825
Net earnings (loss) 5,069 3,820 1,325 (5,869) (8,883) 1,162    
Foreign currency translation adjustments 0 0 0 0 0 0    
Pension liability adjustment, net of tax 0 0 0 0 0 0    
Cash dividends declared (2,341) (2,334) (2,336) (2,363) (2,355) (2,357)    
Issuance of restricted stock 0     0        
Share-based compensation expense 0 0 0 0 0 0    
Shares purchased and retired   (435) (1,017)     (1,244)    
Balance 140,706 137,978 136,927 136,916 145,148 156,386 140,706 136,916
Accumulated Other Comprehensive Loss                
Balance (27,607) (27,965) (28,005) (25,222) (26,956) (24,536) (28,005) (24,536)
Net earnings (loss) 0 0 0 0 0 0    
Foreign currency translation adjustments (601) 176 (143) 751 1,590 (2,558)    
Pension liability adjustment, net of tax 183 182 183 142 144 138    
Cash dividends declared 0 0 0 0 0 0    
Issuance of restricted stock 0     0        
Share-based compensation expense 0 0 0 0 0 0    
Shares purchased and retired   0 0     0    
Balance $ (28,025) $ (27,607) $ (27,965) $ (24,329) $ (25,222) $ (26,956) $ (28,025) $ (24,329)