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Fair Value Measurement (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Assets:    
Short-term investments $ 150,486  
Foreign currency forward exchange contracts not accounted for using hedge accounting 11 784
Assets 150,497  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Assets:    
Short-term investments     
Foreign currency forward exchange contracts not accounted for using hedge accounting      
Assets     
Significant Other Observable Inputs (Level 2) [Member]
   
Assets:    
Short-term investments 150,486  
Foreign currency forward exchange contracts not accounted for using hedge accounting 11 784
Assets 150,497  
Significant Unobservable Inputs (Level 3) [Member]
   
Assets:    
Short-term investments     
Foreign currency forward exchange contracts not accounted for using hedge accounting      
Assets