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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Stockholders Equity Note [Line Items]        
Balance, December 31, 2015     $ 204,729  
Net earnings $ 4,701 $ 5,377 8,411 $ 11,054
Foreign currency translation adjustments 261 $ (1,609) 1,222 $ (3,109)
Pension liability adjustment, net of tax     767  
Balance, September 30, 2016 200,732   200,732  
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  
Cash dividends paid to noncontrolling interest     0  
Stock options exercised     25  
Issuance of restricted stock     27  
Stock-based compensation expense     0  
Income tax benefit from stock options exercised     0  
Shares purchased and retired     (352)  
Balance, September 30, 2016 10,467   10,467  
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  
Cash dividends paid to noncontrolling interest     0  
Stock options exercised     560  
Issuance of restricted stock     (27)  
Stock-based compensation expense     1,121  
Income tax benefit from stock options exercised     3  
Shares purchased and retired     0  
Balance, September 30, 2016 47,416   47,416  
Reinvested Earnings [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2015     160,325  
Net earnings     8,287  
Foreign currency translation adjustments     0  
Pension liability adjustment, net of tax     0  
Cash dividends declared     (6,568)  
Cash dividends paid to noncontrolling interest     0  
Stock options exercised     0  
Issuance of restricted stock     0  
Stock-based compensation expense     0  
Income tax benefit from stock options exercised     0  
Shares purchased and retired     (9,016)  
Balance, September 30, 2016 153,028   153,028  
Accumulated Other Comprehensive Loss [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2015     (18,467)  
Net earnings     0  
Foreign currency translation adjustments     970  
Pension liability adjustment, net of tax     767  
Cash dividends declared     0  
Cash dividends paid to noncontrolling interest     0  
Stock options exercised     0  
Issuance of restricted stock     0  
Stock-based compensation expense     0  
Income tax benefit from stock options exercised     0  
Shares purchased and retired     0  
Balance, September 30, 2016 (16,730)   (16,730)  
Noncontrolling Interest [Member]        
Stockholders Equity Note [Line Items]        
Balance, December 31, 2015     6,345  
Net earnings     124  
Foreign currency translation adjustments     252  
Pension liability adjustment, net of tax     0  
Cash dividends declared     0  
Cash dividends paid to noncontrolling interest     (170)  
Stock options exercised     0  
Issuance of restricted stock     0  
Stock-based compensation expense     0  
Income tax benefit from stock options exercised     0  
Shares purchased and retired     0  
Balance, September 30, 2016 $ 6,551   $ 6,551