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Derivatives, Net - Summary of Non-Designated Foreign Exchange Forwards (Details) - Not Designated as Hedging Instrument [Member] - Forward Currency Contract [Member] | Sep. 30, 2018 GBP (£) contract | Dec. 31, 2017 GBP (£) contract
--- | --- | ---
GBP |  |
Derivative [Line Items] |  |
Number of Contracts | contract | 35 | 24
Aggregate Notional Amount (in thousands) | £ | £ 274,309,000 | £ 177,077
EUR |  |
Derivative [Line Items] |  |
Number of Contracts | contract | 1 |
Aggregate Notional Amount (in thousands) | £ | £ 42,247,000 |

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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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- Details
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