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Derivatives - Narrative (Details) $ in Thousands, € in Millions, £ in Millions, kr in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 GBP (£) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 NOK (kr)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Deposits related to agreements included in other assets | $ 800 | $ 1,900 |  |  |  |  |  |
Investments in unconsolidated joint ventures | 2,446,336 | 1,690,839 |  |  |  |  |  |
Net Investment Hedging |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Derivatives used in net investment hedge, gain (loss), reclassified to earnings upon dedesignation |  |  | $ 1,600 |  |  |  |  |
Non-Designated Hedges | Net Investment Hedging |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Derivatives used in net investment hedge, gain (loss), reclassified to earnings upon dedesignation | 3,726 | (3,928) |  |  |  |  |  |
Designated Hedges | Other gain (loss), net | Net Investment Hedging |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Realization of net gain on net investment hedges | 7,426 | (3,931) | $ 62 |  |  |  |  |
Foreign currency risk |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures | $ 1,000,000 | $ 1,100,000 |  | £ 235.7 | € 614.0 | £ 250.6 | € 499.2 | kr 771.2

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