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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Balance   $ 209,994     $ 209,994  
Net earnings $ (8,883)   $ 1,514   (7,721) $ 5,482
Foreign currency translation adjustments 1,590   100   (968) 230
Pension liability adjustment, net of tax         (282)  
Balance 196,272       196,272  
Common Stock [Member]            
Balance 9,813 9,873 9,995 $ 10,057 9,873 10,057
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price     7 1    
Issuance of restricted stock       1    
Shares purchased and retired   (60)   (64)    
Balance 9,813 9,813 10,002 9,995 9,813 10,002
Capital in Excess of Par Value [Member]            
Balance 66,183 65,832 64,634 64,263 65,832 64,263
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price     142 6    
Issuance of restricted stock       (1)    
Share-based compensation expense 350 351 (365) 366    
Balance 66,533 66,183 65,141 64,634 66,533 65,141
Reinvested Earnings [Member]            
Balance 156,386 158,825 152,740 152,835 158,825 152,835
Net earnings (8,883) 1,162 1,514 3,968    
Cash dividends declared (2,355) (2,357) (2,401) (2,299)    
Shares purchased and retired   (1,244)   (1,764)    
Balance 145,148 156,386 151,853 152,740 145,148 151,853
Accumulated Other Comprehensive Loss [Member]            
Balance (26,956) (24,536) (21,334) (21,572) (24,536) (21,572)
Foreign currency translation adjustments 1,590 (2,558) 100 130    
Pension liability adjustment, net of tax 144 138 123 108    
Balance $ (25,222) $ (26,956) $ (21,111) $ (21,334) $ (25,222) $ (21,111)