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Debt - Mortgage Notes Payable (Details)
6 Months Ended
Jun. 30, 2017
USD ($)
property
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]    
Weighted-Average Interest Rate 4.20%  
Weighted-Average Years to Maturity 4 years 6 days  
Mortgage Notes Payable [Member]    
Debt Instrument [Line Items]    
Encumbered Properties | property 584  
Gross Carrying Value of Collateralized Properties $ 4,661,149,000  
Outstanding Balance $ 2,351,293,000 $ 2,629,949,000
Weighted-Average Interest Rate 5.03%  
Mortgage Notes Payable [Member] | Unconsolidated Joint Venture [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 20,400,000  
Mortgage Notes Payable [Member] | Weighted-Average [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 4 years 6 months  
Mortgage Notes Payable [Member] | Maximum [Member] | Unconsolidated Joint Venture [Member]    
Debt Instrument [Line Items]    
Fixed and variable rate, maximum 5.20%  
Mortgage Notes Payable [Member] | Fixed-rate debt [Member]    
Debt Instrument [Line Items]    
Encumbered Properties | property 583  
Gross Carrying Value of Collateralized Properties $ 4,628,671,000  
Outstanding Balance $ 2,336,985,000  
Weighted-Average Interest Rate 5.03%  
Mortgage Notes Payable [Member] | Fixed-rate debt [Member] | Interest Rate Swap [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 130,300,000  
Mortgage Notes Payable [Member] | Fixed-rate debt [Member] | Weighted-Average [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 4 years 6 months  
Mortgage Notes Payable [Member] | Variable-rate debt [Member]    
Debt Instrument [Line Items]    
Encumbered Properties | property 1  
Gross Carrying Value of Collateralized Properties $ 32,478,000  
Outstanding Balance $ 14,308,000  
Weighted-Average Interest Rate 4.00%  
Mortgage Notes Payable [Member] | Variable-rate debt [Member] | Weighted-Average [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 1 month 6 days  
Mortgage Notes Payable [Member] | Recourse debt [Member] | Unconsolidated Joint Venture [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 0