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Derivatives, Net - Summary of Non-Designated Foreign Exchange Forwards (Details) - GBP - Not Designated as Hedging Instrument [Member] - Forward Currency Contract [Member] $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) contract | Dec. 31, 2018 USD ($) contract
Derivative [Line Items] |  |
Number of Contracts | contract | 78 | 43
Aggregate Notional Amount (in thousands) | $ | $ 259,604 | $ 270,161
Weighted-Average Years to Maturity | 1 year 26 days | 8 months 9 days

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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 Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Details
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- Details
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- Details
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