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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