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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Balance     $ 209,994       $ 209,994  
Net earnings (loss) $ (5,869)     $ 6,585     (13,590) $ 12,067
Foreign currency translation adjustments 751     (711)     (217) (481)
Pension liability adjustment, net of tax             (424)  
Balance 189,295           189,295  
Common Stock                
Balance 9,813 $ 9,813 9,873 10,002 $ 9,995 $ 10,057 9,873 10,057
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    
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price         7 1    
Issuance of restricted stock 31     30   1    
Share-based compensation expense 0 0 0 0 0 0    
Shares purchased and retired     (60) (91)   (64)    
Balance 9,844 9,813 9,813 9,941 10,002 9,995 9,844 9,941
Capital in Excess of Par Value                
Balance 66,533 66,183 65,832 65,141 64,634 64,263 65,832 64,263
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    
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price         142 6    
Issuance of restricted stock (31)     (30)   (1)    
Share-based compensation expense 362 350 351 371 365 366    
Shares purchased and retired     0 0   0    
Balance 66,864 66,533 66,183 65,482 65,141 64,634 66,864 65,482
Reinvested Earnings                
Balance 145,148 156,386 158,825 151,853 152,740 152,835 158,825 152,835
Net earnings (loss) (5,869) (8,883) 1,162 6,585 1,514 3,968    
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 (2,363) (2,355) (2,357) (2,395) (2,401) (2,299)    
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price         0 0    
Issuance of restricted stock 0     0   0    
Share-based compensation expense 0 0 0 0 0 0    
Shares purchased and retired     (1,244) (2,110)   (1,764)    
Balance 136,916 145,148 156,386 153,933 151,853 152,740 136,916 153,933
Accumulated Other Comprehensive Loss                
Balance (25,222) (26,956) (24,536) (21,111) (21,334) (21,572) (24,536) (21,572)
Net earnings (loss) 0 0 0 0 0 0    
Foreign currency translation adjustments 751 1,590 (2,558) (711) 100 130    
Pension liability adjustment, net of tax 142 144 138 116 123 108    
Cash dividends declared 0 0 0 0 0 0    
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price         0 0    
Issuance of restricted stock 0     0   0    
Share-based compensation expense 0 0 0 0 0 0    
Shares purchased and retired     0 0   0    
Balance $ (24,329) $ (25,222) $ (26,956) $ (21,706) $ (21,111) $ (21,334) $ (24,329) $ (21,706)