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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stockholders Equity Note [Line Items]        
Balance, December 31, 2016     $ 208,280  
Net earnings $ 1,303 $ 1,078 3,418 $ 3,710
Foreign currency translation adjustments 533 $ (312) 1,220 $ 961
Pension liability adjustment, net of tax     (161)  
Balance, June 30, 2017 202,809   202,809  
Common Stock [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2016     10,505  
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  
Stock options exercised     17  
Stock-based compensation expense     0  
Income tax benefit from stock options exercised     0  
Shares purchased and retired     (248)  
Balance, June 30, 2017 10,274   10,274  
Capital in Excess of Par Value [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2016     50,184  
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  
Stock options exercised     421  
Stock-based compensation expense     779  
Income tax benefit from stock options exercised     22  
Shares purchased and retired     0  
Balance, June 30, 2017 51,406   51,406  
Reinvested Earnings [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2016     157,468  
Net earnings     3,474  
Foreign currency translation adjustments     0  
Pension liability adjustment, net of tax     0  
Cash dividends declared     (4,462)  
Cash dividends paid to noncontrolling interest     0  
Stock options exercised     0  
Stock-based compensation expense     0  
Income tax benefit from stock options exercised     0  
Shares purchased and retired     (6,595)  
Balance, June 30, 2017 149,885   149,885  
Accumulated Other Comprehensive Loss [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2016     (16,569)  
Net earnings     0  
Foreign currency translation adjustments     918  
Pension liability adjustment, net of tax     161  
Cash dividends declared     0  
Cash dividends paid to noncontrolling interest     0  
Stock options exercised     0  
Stock-based compensation expense     0  
Income tax benefit from stock options exercised     0  
Shares purchased and retired     0  
Balance, June 30, 2017 (15,490)   (15,490)  
Noncontrolling Interest [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2016     6,692  
Net earnings     (56)  
Foreign currency translation adjustments     302  
Pension liability adjustment, net of tax     0  
Cash dividends declared     0  
Cash dividends paid to noncontrolling interest     (204)  
Stock options exercised     0  
Stock-based compensation expense     0  
Income tax benefit from stock options exercised     0  
Shares purchased and retired     0  
Balance, June 30, 2017 $ 6,734   $ 6,734