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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Stockholders Equity Note [Line Items]        
Balance, December 31, 2017     $ 205,659  
Net earnings $ 6,152 $ 4,920 10,491 $ 8,338
Foreign currency translation adjustments (182) $ 452 (1,292) $ 1,672
Pension liability adjustment, net of tax     (352)  
Balance, September 30, 2018 202,576   202,576  
Common Stock [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2017     10,162  
Net earnings     0  
Foreign currency translation adjustments     0  
Pension liability adjustment, net of tax     0  
Cash dividends declared     0  
Cash dividends paid to noncontrolling interest     0  
Purchase of noncontrolling interest     0  
Stock options exercised     218  
Issuance of restricted stock     25  
Restricted stock forfeited     (4)  
Stock-based compensation expense     0  
Shares purchased and retired     (199)  
Balance, September 30, 2018 10,202   10,202  
Capital in Excess of Par Value [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2017     55,884  
Net earnings     0  
Foreign currency translation adjustments     0  
Pension liability adjustment, net of tax     0  
Cash dividends declared     0  
Cash dividends paid to noncontrolling interest     0  
Purchase of noncontrolling interest     3,535  
Stock options exercised     3,391  
Issuance of restricted stock     (25)  
Restricted stock forfeited     4  
Stock-based compensation expense     1,149  
Shares purchased and retired     0  
Balance, September 30, 2018 63,938   63,938  
Reinvested Earnings [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2017     150,350  
Net earnings     10,889  
Foreign currency translation adjustments     0  
Pension liability adjustment, net of tax     0  
Cash dividends declared     (6,975)  
Cash dividends paid to noncontrolling interest     0  
Purchase of noncontrolling interest     0  
Stock options exercised     0  
Issuance of restricted stock     0  
Restricted stock forfeited     0  
Stock-based compensation expense     0  
Shares purchased and retired     (6,390)  
Balance, September 30, 2018 147,874   147,874  
Accumulated Other Comprehensive Loss [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2017     (17,859)  
Net earnings     0  
Foreign currency translation adjustments     (820)  
Pension liability adjustment, net of tax     352  
Cash dividends declared     0  
Cash dividends paid to noncontrolling interest     0  
Purchase of noncontrolling interest     (1,111)  
Stock options exercised     0  
Issuance of restricted stock     0  
Restricted stock forfeited     0  
Stock-based compensation expense     0  
Shares purchased and retired     0  
Balance, September 30, 2018 (19,438)   (19,438)  
Noncontrolling Interest [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2017     7,122  
Net earnings     (398)  
Foreign currency translation adjustments     (472)  
Pension liability adjustment, net of tax     0  
Cash dividends declared     0  
Cash dividends paid to noncontrolling interest     (88)  
Purchase of noncontrolling interest     (6,164)  
Stock options exercised     0  
Issuance of restricted stock     0  
Restricted stock forfeited     0  
Stock-based compensation expense     0  
Shares purchased and retired     0  
Balance, September 30, 2018 $ 0   $ 0