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Fair Value of Financial Instruments Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Foreign Exchange Contract [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax $ 410 $ 251
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (248) 13
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax 162 264
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax (37) (51)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax 125 $ 213
Foreign Currency Contract, INR [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months 1,000  
Revenues [Member] | Foreign Currency Contract, Euro and INR [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months $ 1,200