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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Balance $ 205,583  
Net earnings 3,968 $ 2,816
Foreign currency translation adjustments 130 (119)
Pension liability adjustment, net of tax (108)  
Balance 206,035  
Common Stock [Member]    
Balance 10,057 10,162
Net earnings 0 0
Foreign currency translation adjustments 0 0
Pension liability adjustment, net of tax 0 0
Cash dividends declared 0 0
Cash dividends paid to noncontrolling interest   0
Stock options exercised 1 108
Restricted stock forfeited   (2)
Issuance of restricted stock 1  
Share-based compensation expense 0 0
Shares purchased and retired (64)  
Balance 9,995 10,268
Capital in Excess of Par Value [Member]    
Balance 64,263 55,884
Net earnings 0 0
Foreign currency translation adjustments 0 0
Pension liability adjustment, net of tax 0 0
Cash dividends declared 0 0
Cash dividends paid to noncontrolling interest   0
Stock options exercised 6 2,776
Restricted stock forfeited   2
Issuance of restricted stock (1)  
Share-based compensation expense 366 351
Shares purchased and retired 0  
Balance 64,634 59,013
Reinvested Earnings [Member]    
Balance 152,835 150,350
Net earnings 3,968 2,987
Foreign currency translation adjustments 0 0
Pension liability adjustment, net of tax 0 0
Cash dividends declared (2,299) (2,257)
Cash dividends paid to noncontrolling interest   0
Stock options exercised 0 0
Restricted stock forfeited   0
Issuance of restricted stock 0  
Share-based compensation expense 0 0
Shares purchased and retired (1,764)  
Balance 152,740 151,080
Accumulated Other Comprehensive Loss [Member]    
Balance (21,572) (17,859)
Net earnings 0 0
Foreign currency translation adjustments 130 (85)
Pension liability adjustment, net of tax 108 118
Cash dividends declared 0 0
Cash dividends paid to noncontrolling interest   0
Stock options exercised 0 0
Restricted stock forfeited   0
Issuance of restricted stock 0  
Share-based compensation expense 0 0
Shares purchased and retired 0  
Balance $ (21,334) (17,826)
Noncontrolling Interest [Member]    
Balance   7,122
Net earnings   (171)
Foreign currency translation adjustments   (34)
Pension liability adjustment, net of tax   0
Cash dividends declared   0
Cash dividends paid to noncontrolling interest   (88)
Stock options exercised   0
Restricted stock forfeited   0
Share-based compensation expense   0
Balance   $ 6,829