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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Assets:      
Foreign currency forward exchange contracts     $ 16
Liabilities:      
Foreign currency forward exchange contracts     109
Net gain on foreign currency forward exchange contracts 1,073 969  
Notional amount of foreign currency derivatives 33,518   30,280
Fair Value
      
Assets:      
Foreign currency forward exchange contracts 108    
Total Assets 108    
Liabilities:      
Foreign currency forward exchange contracts 6    
Total Liabilities 6    
Level 1
      
Assets:      
Foreign currency forward exchange contracts 0    
Total Assets 0    
Liabilities:      
Foreign currency forward exchange contracts 0    
Total Liabilities 0    
Level 2
      
Assets:      
Foreign currency forward exchange contracts 108    
Total Assets 108    
Liabilities:      
Foreign currency forward exchange contracts 6    
Total Liabilities 6    
Level 3
      
Assets:      
Foreign currency forward exchange contracts 0    
Total Assets 0    
Liabilities:      
Foreign currency forward exchange contracts 0    
Total Liabilities $ 0