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Debt (Mortgage Notes Payable) (Details)
6 Months Ended
Jun. 30, 2016
USD ($)
property
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]    
Weighted-Average Interest Rate 3.90%  
Weighted-Average Years to Maturity 3 years 10 months 24 days  
Mortgage Notes Payable [Member]    
Debt Instrument [Line Items]    
Encumbered Properties | property 647  
Gross Carrying Value of Collateralized Properties $ 5,558,746,000  
Outstanding Balance $ 2,881,257,000 $ 3,039,882,000
Weighted-Average Interest Rate 5.07%  
Mortgage Notes Payable [Member] | Unconsolidated Joint Venture [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 46,200,000  
Weighted-Average Interest Rate 3.89%  
Fixed and variable rate, minimum 2.85%  
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 9 months 18 days  
Mortgage Notes Payable [Member] | Weighted-Average [Member] | Unconsolidated Joint Venture [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 2 years 4 months 10 days  
Mortgage Notes Payable [Member] | Fixed-rate debt [Member]    
Debt Instrument [Line Items]    
Encumbered Properties | property 646  
Gross Carrying Value of Collateralized Properties $ 5,533,439,000  
Outstanding Balance $ 2,872,507,000  
Weighted-Average Interest Rate 5.07%  
Mortgage Notes Payable [Member] | Fixed-rate debt [Member] | Interest Rate Swap [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 247,700,000  
Mortgage Notes Payable [Member] | Fixed-rate debt [Member] | Weighted-Average [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 4 years 9 months 18 days  
Mortgage Notes Payable [Member] | Variable-rate debt [Member]    
Debt Instrument [Line Items]    
Encumbered Properties | property 1  
Gross Carrying Value of Collateralized Properties $ 25,307,000  
Outstanding Balance $ 8,750,000  
Weighted-Average Interest Rate 3.41%  
Mortgage Notes Payable [Member] | Variable-rate debt [Member] | Weighted-Average [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 2 months 12 days  
Mortgage Notes Payable [Member] | Recourse debt [Member] | Unconsolidated Joint Venture [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 0