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Fair Value Measurement (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Assets:    
Short-term investments $ 115,674 $ 94,202
Foreign currency forward exchange contracts not accounted for using hedge accounting 6  
Foreign currency forward exchange contracts accounted for using hedge accounting 493  
Total Assets 116,173  
Liabilities:    
Foreign currency forward exchange contracts accounted for using hedge accounting   181
Foreign currency forward exchange contracts not accounted for using hedge accounting   418
Interest rate swap 743 908
Total Liabilities   1,507
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets:    
Short-term investments 0 0
Foreign currency forward exchange contracts accounted for using hedge accounting 0  
Total Assets 0  
Liabilities:    
Foreign currency forward exchange contracts accounted for using hedge accounting   0
Foreign currency forward exchange contracts not accounted for using hedge accounting   0
Interest rate swap 0 0
Total Liabilities   0
Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Short-term investments 115,674 94,202
Foreign currency forward exchange contracts not accounted for using hedge accounting 6  
Foreign currency forward exchange contracts accounted for using hedge accounting 493  
Total Assets 116,173  
Liabilities:    
Foreign currency forward exchange contracts accounted for using hedge accounting   181
Foreign currency forward exchange contracts not accounted for using hedge accounting   418
Interest rate swap 743 908
Total Liabilities   1,507
Significant Unobservable Inputs (Level 3) [Member]    
Assets:    
Short-term investments 0 0
Foreign currency forward exchange contracts accounted for using hedge accounting 0  
Total Assets 0  
Liabilities:    
Foreign currency forward exchange contracts accounted for using hedge accounting   0
Foreign currency forward exchange contracts not accounted for using hedge accounting   0
Interest rate swap $ 0 0
Total Liabilities   $ 0