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Hedging Instruments (Derivatives Designated In Cash Flow Hedging Relationships) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Foreign Currency Fair Value Hedge Derivative [Line Items] |  |  |  |
Cost of revenue | $ 260,353 | $ 239,805 | $ 767,062 | $ 722,675
Cash flow hedging | Derivatives and non-derivatives designated as hedging instruments | Foreign currency exchange contracts | Costs of revenue |  |  |  |
Foreign Currency Fair Value Hedge Derivative [Line Items] |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income into income | $ 3,171 | $ 256 | $ 7,091 | $ (2,412)

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