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Fair Value Measurement (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Assets:    
Short-term investments $ 227,315 $ 181,677
Foreign currency forward exchange contracts not accounted for using hedge accounting 96 157
Assets 227,411 181,834
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 227,315 181,677
Foreign currency forward exchange contracts not accounted for using hedge accounting 96 157
Assets 227,411 181,834
Significant Unobservable Inputs (Level 3) [Member]
   
Assets:    
Short-term investments      
Foreign currency forward exchange contracts not accounted for using hedge accounting      
Assets