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Derivative Financial Instruments and Hedging Activities - Notional Amounts of Outstanding Positions (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency exchange contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 107,400 | $ 44,800
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency option contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 48,000 | 91,000
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 650,000 | 650,000
Not Designated as Hedging Instrument | Foreign currency exchange contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 18,439 | $ 0

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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