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Derivatives - Summary of Non-Designated Foreign Exchange Forwards (Details) - Not Designated as Hedging Instrument $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) contract | Dec. 31, 2018 USD ($) contract
Interest Rate Swap |  |
Derivative [Line Items] |  |
Number of Contracts | contract | 1 |
Aggregate Notional Amount (in thousands) | $ | $ 500,000 |
Weighted-Average Years to Maturity | 6 years 10 months 13 days |
GBP | Forward Currency Contract |  |
Derivative [Line Items] |  |
Number of Contracts | contract | 95 | 43
Aggregate Notional Amount (in thousands) | $ | $ 271,961 | $ 270,161
Weighted-Average Years to Maturity | 10 months 20 days | 8 months 8 days
EUR | Forward Currency Contract |  |
Derivative [Line Items] |  |
Number of Contracts | contract | 15 |
Aggregate Notional Amount (in thousands) | $ | $ 183,689 |
Weighted-Average Years to Maturity | 10 months 13 days |

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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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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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