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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Stockholders Equity Note [Line Items]    
Balance, December 31, 2017 $ 205,659  
Net earnings 2,816 $ 2,115
Foreign currency translation adjustments (119) $ 687
Pension liability adjustment, net of tax (118)  
Balance, March 31, 2018 209,364  
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  
Stock options exercised 108  
Restricted stock forfeited (2)  
Stock-based compensation expense 0  
Balance, March 31, 2018 10,268  
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  
Stock options exercised 2,776  
Restricted stock forfeited 2  
Stock-based compensation expense 351  
Balance, March 31, 2018 59,013  
Reinvested Earnings [Member]    
Stockholders Equity Note [Line Items]    
Balance, December 31, 2017 150,350  
Net earnings 2,987  
Foreign currency translation adjustments 0  
Pension liability adjustment, net of tax 0  
Cash dividends declared (2,257)  
Cash dividends paid to noncontrolling interest 0  
Stock options exercised 0  
Restricted stock forfeited 0  
Stock-based compensation expense 0  
Balance, March 31, 2018 151,080  
Accumulated Other Comprehensive Loss [Member]    
Stockholders Equity Note [Line Items]    
Balance, December 31, 2017 (17,859)  
Net earnings 0  
Foreign currency translation adjustments (85)  
Pension liability adjustment, net of tax 118  
Cash dividends declared 0  
Cash dividends paid to noncontrolling interest 0  
Stock options exercised 0  
Restricted stock forfeited 0  
Stock-based compensation expense 0  
Balance, March 31, 2018 (17,826)  
Noncontrolling Interest [Member]    
Stockholders Equity Note [Line Items]    
Balance, December 31, 2017 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  
Stock-based compensation expense 0  
Balance, March 31, 2018 $ 6,829