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Fair Value Measurement (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Assets:    
Short-term investments $ 90,219 $ 190,152
Foreign currency forward exchange contracts not accounted for using hedge accounting 285  
Total assets 90,504  
Liabilities:    
Interest rate swaps $ 670  
Foreign currency forward exchange contracts not accounted for using hedge accounting   $ 355
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  
Total assets  
Liabilities:    
Interest rate swaps  
Foreign currency forward exchange contracts not accounted for using hedge accounting  
Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Short-term investments $ 90,219 $ 190,152
Foreign currency forward exchange contracts not accounted for using hedge accounting 285  
Total assets 90,504  
Liabilities:    
Interest rate swaps $ 670  
Foreign currency forward exchange contracts not accounted for using hedge accounting   $ 355
Significant Unobservable Inputs (Level 3) [Member]    
Assets:    
Short-term investments
Foreign currency forward exchange contracts not accounted for using hedge accounting  
Total assets  
Liabilities:    
Interest rate swaps  
Foreign currency forward exchange contracts not accounted for using hedge accounting