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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Level 1    
Assets:    
Total Assets $ 0 $ 0
Liabilities:    
Total Liabilities 0 0
Level 1 | Foreign currency forward exchange contracts    
Assets:    
Foreign currency contract, asset fair value 0 0
Liabilities:    
Foreign currency contract, liability fair value 0 0
Level 1 | Foreign currency option contracts    
Assets:    
Foreign currency contract, asset fair value 0 0
Level 2    
Assets:    
Total Assets 8,229 7,746
Liabilities:    
Total Liabilities 31,325 35,386
Level 2 | Foreign currency forward exchange contracts    
Assets:    
Foreign currency contract, asset fair value 8,017 7,660
Liabilities:    
Foreign currency contract, liability fair value 31,325 35,386
Level 2 | Foreign currency option contracts    
Assets:    
Foreign currency contract, asset fair value 212 86
Level 3    
Assets:    
Total Assets 0 0
Liabilities:    
Total Liabilities 0 0
Level 3 | Foreign currency forward exchange contracts    
Assets:    
Foreign currency contract, asset fair value 0 0
Liabilities:    
Foreign currency contract, liability fair value 0 0
Level 3 | Foreign currency option contracts    
Assets:    
Foreign currency contract, asset fair value 0 0
Fair Value    
Assets:    
Total Assets 8,229 7,746
Liabilities:    
Total Liabilities 31,325 35,386
Fair Value | Foreign currency forward exchange contracts    
Assets:    
Foreign currency contract, asset fair value 8,017 7,660
Liabilities:    
Foreign currency contract, liability fair value 31,325 35,386
Fair Value | Foreign currency option contracts    
Assets:    
Foreign currency contract, asset fair value $ 212 $ 86