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Hedging Instruments (Derivatives Designated in Cash Flow Hedging Relationships) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Foreign Currency Fair Value Hedge Derivative [Line Items] |  |  |
Total cost of revenue | $ 1,041,359 | $ 971,700 | $ 871,676
Foreign currency exchange contracts | Cost of revenue |  |  |
Foreign Currency Fair Value Hedge Derivative [Line Items] |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income into income | $ 10,628 | $ (976) | $ 27

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