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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Stockholders Equity Note [Line Items]        
Balance, December 31, 2015     $ 204,729  
Net earnings $ 1,078 $ 2,085 3,710 $ 5,677
Foreign currency translation adjustments (312) $ 97 961 $ (1,500)
Pension liability adjustment, net of tax     511  
Balance, June 30, 2016 200,627   200,627  
Common Stock [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2015     10,767  
Net earnings     0  
Foreign currency translation adjustments     0  
Pension liability adjustment, net of tax     0  
Cash dividends declared     0  
Stock options exercised     19  
Stock-based compensation expense     0  
Income tax benefit from stock options exercised     0  
Shares purchased and retired     (229)  
Balance, June 30, 2016 10,557   10,557  
Capital in Excess of Par Value [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2015     45,759  
Net earnings     0  
Foreign currency translation adjustments     0  
Pension liability adjustment, net of tax     0  
Cash dividends declared     0  
Stock options exercised     434  
Stock-based compensation expense     727  
Income tax benefit from stock options exercised     0  
Balance, June 30, 2016 46,920   46,920  
Reinvested Earnings [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2015     160,325  
Net earnings     3,687  
Foreign currency translation adjustments     0  
Pension liability adjustment, net of tax     0  
Cash dividends declared     (4,358)  
Stock options exercised     0  
Stock-based compensation expense     0  
Income tax benefit from stock options exercised     0  
Shares purchased and retired     (5,877)  
Balance, June 30, 2016 153,777   153,777  
Accumulated Other Comprehensive Loss [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2015     (18,467)  
Net earnings     0  
Foreign currency translation adjustments     843  
Pension liability adjustment, net of tax     511  
Cash dividends declared     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, 2016 (17,113)   (17,113)  
Noncontrolling Interest [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2015     6,345  
Net earnings     23  
Foreign currency translation adjustments     118  
Pension liability adjustment, net of tax     0  
Cash dividends declared     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, 2016 $ 6,486   $ 6,486