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Fair Value Measurement (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Assets:    
Short-term investments $ 115,884 $ 82,847
Foreign currency forward exchange contracts not accounted for using hedge accounting   123
Total assets   82,970
Liabilities:    
Foreign currency forward exchange contracts not accounted for using hedge accounting 57  
Interest rate swaps 1,420 1,026
Liabilities, Fair Value Disclosure 1,477  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets:    
Short-term investments 0 0
Foreign currency forward exchange contracts not accounted for using hedge accounting   0
Total assets   0
Liabilities:    
Foreign currency forward exchange contracts not accounted for using hedge accounting 0  
Interest rate swaps 0 0
Liabilities, Fair Value Disclosure 0  
Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Short-term investments 115,884 82,847
Foreign currency forward exchange contracts not accounted for using hedge accounting   123
Total assets   82,970
Liabilities:    
Foreign currency forward exchange contracts not accounted for using hedge accounting 57  
Interest rate swaps 1,420 1,026
Liabilities, Fair Value Disclosure 1,477  
Significant Unobservable Inputs (Level 3) [Member]    
Assets:    
Short-term investments 0 0
Foreign currency forward exchange contracts not accounted for using hedge accounting   0
Total assets   0
Liabilities:    
Foreign currency forward exchange contracts not accounted for using hedge accounting 0  
Interest rate swaps 0 $ 0
Liabilities, Fair Value Disclosure $ 0