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Equity (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Stockholders Equity Note [Line Items]        
Beginning Balance     $ 196,992  
Net earnings 2,501 2,265 5,751 5,390
Foreign currency translation adjustments 546 (1,551) 630 (2,027)
Pension liability adjustment, net of tax 96 268 216 501
Ending Balance 199,638   199,638  
Common Stock [Member]
        
Stockholders Equity Note [Line Items]        
Beginning Balance     10,876  
Net earnings     0  
Foreign currency translation adjustments     0  
Pension liability adjustment, net of tax     0  
Cash dividends declared     0  
Stock options exercised     32  
Stock-based compensation expense     0  
Income tax benefit from stock options exercised     0  
Shares purchased and retired     (48)  
Ending Balance 10,860   10,860  
Capital in Excess of Par Value [Member]
        
Stockholders Equity Note [Line Items]        
Beginning Balance     31,729  
Net earnings     0  
Foreign currency translation adjustments     0  
Pension liability adjustment, net of tax     0  
Cash dividends declared     0  
Stock options exercised     576  
Stock-based compensation expense     676  
Income tax benefit from stock options exercised     37  
Shares purchased and retired     0  
Ending Balance 33,018   33,018  
Reinvested Earnings [Member]
        
Stockholders Equity Note [Line Items]        
Beginning Balance     156,983  
Net earnings     5,412  
Foreign currency translation adjustments     0  
Pension liability adjustment, net of tax     0  
Cash dividends declared     (4,023)  
Stock options exercised     0  
Stock-based compensation expense     0  
Income tax benefit from stock options exercised     0  
Shares purchased and retired     (1,201)  
Ending Balance 157,171   157,171  
Accumulated Other Comprehensive Income (Loss) [Member]
        
Stockholders Equity Note [Line Items]        
Beginning Balance     (9,422)  
Net earnings     0  
Foreign currency translation adjustments     392  
Pension liability adjustment, net of tax     216  
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  
Ending Balance (8,814)   (8,814)  
Noncontrolling Interest [Member]
        
Stockholders Equity Note [Line Items]        
Beginning Balance     6,826  
Net earnings     339  
Foreign currency translation adjustments     238  
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  
Ending Balance $ 7,403   $ 7,403