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Fair Value Measurement (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Assets:    
Short-term investments $ 53,244 $ 67,870
Foreign currency forward exchange contracts accounted for using hedge accounting   179
Total Assets   68,049
Liabilities:    
Interest rate swap 65 207
Foreign currency forward exchange contracts accounted for using hedge accounting 147  
Foreign currency forward exchange contracts not accounted for using hedge accounting 1,183 45
Total Liabilities 1,395 252
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets:    
Short-term investments
Foreign currency forward exchange contracts accounted for using hedge accounting  
Total Assets  
Liabilities:    
Interest rate swap
Foreign currency forward exchange contracts accounted for using hedge accounting  
Foreign currency forward exchange contracts not accounted for using hedge accounting
Total Liabilities
Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Short-term investments 53,244 67,870
Foreign currency forward exchange contracts accounted for using hedge accounting   179
Total Assets   68,049
Liabilities:    
Interest rate swap 65 207
Foreign currency forward exchange contracts accounted for using hedge accounting 147  
Foreign currency forward exchange contracts not accounted for using hedge accounting 1,183 45
Total Liabilities 1,395 252
Significant Unobservable Inputs (Level 3) [Member]    
Assets:    
Short-term investments
Foreign currency forward exchange contracts accounted for using hedge accounting  
Total Assets  
Liabilities:    
Interest rate swap
Foreign currency forward exchange contracts not accounted for using hedge accounting
Total Liabilities