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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Stockholders Equity Note [Line Items]    
Balance $ 208,280  
Net earnings 2,115 $ 2,632
Foreign currency translation adjustments 687 1,273
Pension liability adjustment, net of tax 73  
Cash dividends paid to noncontrolling interest 204 $ 0
Balance 207,100  
Common Stock [Member]    
Stockholders Equity Note [Line Items]    
Balance 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 13  
Stock-based compensation expense 0  
Income tax benefit from stock options exercised 0  
Shares purchased and retired (88)  
Balance 10,430  
Capital in Excess of Par Value [Member]    
Stockholders Equity Note [Line Items]    
Balance 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 343  
Stock-based compensation expense 369  
Income tax benefit from stock options exercised 15  
Shares purchased and retired 0  
Balance 50,911  
Reinvested Earnings [Member]    
Stockholders Equity Note [Line Items]    
Balance 157,468  
Net earnings 2,217  
Foreign currency translation adjustments 0  
Pension liability adjustment, net of tax 0  
Cash dividends declared (2,198)  
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 (2,305)  
Balance 155,182  
Accumulated Other Comprehensive Loss [Member]    
Stockholders Equity Note [Line Items]    
Balance (16,569)  
Net earnings 0  
Foreign currency translation adjustments 419  
Pension liability adjustment, net of tax 73  
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 (16,077)  
Noncontrolling Interest [Member]    
Stockholders Equity Note [Line Items]    
Balance 6,692  
Net earnings (102)  
Foreign currency translation adjustments 268  
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 $ 6,654