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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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