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Debt (Mortgage Notes Payable) (Details)
3 Months Ended
Mar. 31, 2016
USD ($)
property
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]    
Weighted-Average Interest Rate 3.79%  
Weighted-Average Years to Maturity 3 years 7 months 6 days  
Line of Credit [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 1,280,000,000 $ 1,460,000,000
Mortgage Notes Payable [Member]    
Debt Instrument [Line Items]    
Encumbered Properties | property 652  
Gross Carrying Value of Collateralized Properties $ 5,558,642,000  
Outstanding Balance $ 2,967,303,000 $ 3,039,882,000
Weighted-Average Interest Rate 5.09%  
Mortgage Notes Payable [Member] | Unconsolidated Joint Venture [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 46,300,000  
Weighted-Average Interest Rate 3.88%  
Fixed and variable rate, minimum 2.84%  
Fixed and variable rate, maximum 5.20%  
Mortgage Notes Payable [Member] | Weighted-Average [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 4 years 10 months 24 days  
Mortgage Notes Payable [Member] | Weighted-Average [Member] | Unconsolidated Joint Venture [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 2 years 7 months 10 days  
Mortgage Notes Payable [Member] | Fixed-rate debt [Member]    
Debt Instrument [Line Items]    
Encumbered Properties | property 651  
Gross Carrying Value of Collateralized Properties $ 5,533,845,000  
Outstanding Balance $ 2,958,859,000  
Weighted-Average Interest Rate 5.10%  
Mortgage Notes Payable [Member] | Fixed-rate debt [Member] | Interest Rate Swap [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 247,900,000  
Mortgage Notes Payable [Member] | Fixed-rate debt [Member] | Weighted-Average [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 4 years 10 months 28 days  
Mortgage Notes Payable [Member] | Variable-rate debt [Member]    
Debt Instrument [Line Items]    
Encumbered Properties | property 1  
Gross Carrying Value of Collateralized Properties $ 24,797,000  
Outstanding Balance $ 8,444,000  
Weighted-Average Interest Rate 3.39%  
Mortgage Notes Payable [Member] | Variable-rate debt [Member] | Weighted-Average [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 5 months 1 day  
Mortgage Notes Payable [Member] | Recourse debt [Member] | Unconsolidated Joint Venture [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 0