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Debt - Mortgage Notes Payable (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
property
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]    
Weighted-Average Interest Rate 4.30%  
Weighted-Average Years to Maturity 4 years 2 months 12 days  
Mortgage Notes Payable [Member]    
Debt Instrument [Line Items]    
Encumbered Properties | property 597  
Gross Carrying Value of Collateralized Properties $ 4,979,924,000  
Outstanding Balance $ 2,553,386,000 $ 2,629,949,000
Weighted-Average Interest Rate 4.99%  
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 7 months 6 days  
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 596  
Gross Carrying Value of Collateralized Properties $ 4,949,078,000  
Outstanding Balance $ 2,539,726,000  
Weighted-Average Interest Rate 4.99%  
Mortgage Notes Payable [Member] | Fixed-rate debt [Member] | Interest Rate Swap [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 188,700,000  
Mortgage Notes Payable [Member] | Fixed-rate debt [Member] | Weighted-Average [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 4 years 7 months 5 days  
Mortgage Notes Payable [Member] | Variable-rate debt [Member]    
Debt Instrument [Line Items]    
Encumbered Properties | property 1  
Gross Carrying Value of Collateralized Properties $ 30,846,000  
Outstanding Balance $ 13,660,000  
Weighted-Average Interest Rate 3.79%  
Mortgage Notes Payable [Member] | Variable-rate debt [Member] | Weighted-Average [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 4 months 24 days  
Mortgage Notes Payable [Member] | Recourse debt [Member] | Unconsolidated Joint Venture [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 0