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Fair Value Measurement (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Assets:    
Short-term investments $ 95,755 $ 82,847
Foreign currency forward exchange contracts not accounted for using hedge accounting 431 123
Total assets 96,186 82,970
Liabilities:    
Interest rate swaps 1,395 1,026
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 0
Total assets 0 0
Liabilities:    
Interest rate swaps 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Short-term investments 95,755 82,847
Foreign currency forward exchange contracts not accounted for using hedge accounting 431 123
Total assets 96,186 82,970
Liabilities:    
Interest rate swaps 1,395 1,026
Significant Unobservable Inputs (Level 3) [Member]    
Assets:    
Short-term investments 0 0
Foreign currency forward exchange contracts not accounted for using hedge accounting 0 0
Total assets 0 0
Liabilities:    
Interest rate swaps $ 0 $ 0