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Fair Value of Financial Instruments Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Other income (expense) [Member] | 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 $ 600   $ 600  
Revenues [Member] | Foreign Currency Contract, Euro [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months 900   900  
Foreign Currency Contract, Euro [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (328) $ 56 (576) $ 69
Foreign Exchange Contract [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax (141) 191 269 442
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax (254) 247 (92) 511
Foreign Currency Contract, INR [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net $ 215 $ 0 $ 215 $ 0