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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Foreign Currency Fair Value Hedge Derivative [Line Items] |  |  |
Total cost of revenue | $ 971,700 | $ 871,676 | $ 799,987
Foreign currency exchange contracts | Designated as Hedging Instrument | Cash Flow Hedges | Cost of revenue |  |  |
Foreign Currency Fair Value Hedge Derivative [Line Items] |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income into income | $ (976) | $ 27 | $ 3,200

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