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Derivatives and Hedging Activities - Narrative (Details) € in Thousands, £ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 24, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 € / $ | Sep. 30, 2018 £ / $ | Jul. 01, 2018 EUR (€) | Jul. 01, 2018 GBP (£) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 € / $ | Dec. 31, 2017 £ / $ | Jul. 24, 2017 EUR (€) | Jul. 24, 2017 USD ($) | Jul. 24, 2017 GBP (£)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on derivatives due to ineffectiveness in earnings |  | $ 107,333 | $ 46,000 | $ 20,699 | $ 100,000 |  |  |  |  |  |  |  |  |  |
Loss for accelerated reclassification of amounts in other comprehensive income to earnings |  | 90,899 |  | 116,572 |  |  |  |  |  |  |  |  |  |  |
Loss to be reclassified from other comprehensive income |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |
Gains (losses) on derivative instruments |  | 1,290,000 | (3,125,000) | 4,688,000 | (6,585,000) |  |  |  |  |  |  |  |  |  |
Swap liability |  | 3,071,000 |  | 3,071,000 |  |  |  |  |  | $ 15,791,000 |  |  |  |  |
Foreign currency derivative instruments, liability fair value |  | 373,000,000 |  | 373,000,000 |  |  |  | € 349,881 | £ 92,213 |  |  |  |  |  |
Line of credit, amount drawn |  | 455,556,000 |  | 455,556,000 |  |  |  |  |  | 298,909,000 |  |  |  |  |
Foreign currency exchange rate (gbp, eur per usd) |  |  |  |  |  | 1.16 | 1.30 |  |  |  | 1.20 | 1.35 |  |  |
Gains (loss) on foreign currency fair value hedge ineffectiveness |  |  | 100,000 |  | (3,800,000) |  |  |  |  |  |  |  |  |  |
Fair value of derivatives in net liability position |  | 3,500,000 |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |
GBP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency derivative instruments, liability fair value |  | 120,100,000 |  | 120,100,000 |  |  |  |  |  |  |  |  |  |  |
EUR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency derivative instruments, liability fair value |  | 406,000,000 |  | 406,000,000 |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | JPMorgan Chase Bank, N.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, amount drawn |  |  |  |  |  |  |  | € 276,500 | £ 40,000 |  |  |  |  |  |
Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (losses) on derivative instruments |  | 1,400,000 | (2,000,000) | 4,800,000 | $ (5,400,000) |  |  |  |  |  |  |  |  |  |
Designated as Hedging Instrument | Net Investment Hedging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | 64,007,000 |  | 64,007,000 |  |  |  |  |  | 121,603,000 |  |  |  |  |
Interest rate swaps, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | £ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 160,000
Payment to settle derivatives | $ 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (losses) on derivative instruments |  |  | $ (1,100,000) |  |  |  |  |  |  |  |  |  |  |  |
Derivative instrument, amount novated | € |  |  |  |  |  |  |  |  |  |  |  |  | € 224,000 |  |
Interest rate swaps, net | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Swap liability |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 |
Cross currency swaps, net (GBP & EUR) | Designated as Hedging Instrument | GBP | Net Investment Hedging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | 64,007,000 |  | 64,007,000 |  |  |  |  |  | 66,282,000 |  |  |  |  | £ 49,100
Payment to settle derivatives | $ 10,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cross currency swaps, net (GBP & EUR) | Designated as Hedging Instrument | EUR | Net Investment Hedging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | $ 0 |  | $ 0 |  |  |  |  |  | $ 43,222,000 |  |  |  |  |

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