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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Balance $ 209,994  
Net earnings 1,162 $ 3,968
Foreign currency translation adjustments (2,558) 130
Pension liability adjustment, net of tax (138)  
Balance 205,426  
Common Stock [Member]    
Balance 9,873 10,057
Stock options exercised   1
Issuance of restricted stock   1
Shares purchased and retired (60) (64)
Balance 9,813 9,995
Capital in Excess Of Par Value [Member]    
Balance 65,832 64,263
Stock options exercised   6
Restricted stock forfeited   (1)
Share-based compensation expense 351 366
Balance 66,183 64,634
Reinvested Earnings [Member]    
Balance 158,825 152,835
Net earnings 1,162 3,968
Cash dividends declared (2,357) (2,299)
Shares purchased and retired (1,244) (1,764)
Balance 156,386 152,740
Accumulated Other Comprehensive Loss [Member]    
Balance (24,536) (21,572)
Foreign currency translation adjustments (2,558) 130
Pension liability adjustment, net of tax 138 108
Balance $ (26,956) $ (21,334)