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Debt (Mortgage Notes Payable) (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
property
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]    
Weighted-Average Interest Rate 3.75%  
Weighted-Average Years to Maturity 3 years 9 months 18 days  
Mortgage Notes Payable [Member]    
Debt Instrument [Line Items]    
Encumbered Properties | property 654  
Gross Carrying Value of Collateralized Properties $ 6,016,054,000  
Outstanding Balance $ 3,039,882,000 $ 3,689,796,000
Weighted-Average Interest Rate 5.08%  
Mortgage Notes Payable [Member] | Unconsolidated Joint Ventures [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 103,300,000  
Weighted-Average Interest Rate 2.95%  
Fixed and variable rate, minimum 2.24%  
Fixed and variable rate, maximum 5.20%  
Mortgage Notes Payable [Member] | Weighted-Average [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 5 years 1 month 2 days  
Mortgage Notes Payable [Member] | Weighted-Average [Member] | Unconsolidated Joint Ventures [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 1 year 10 months 24 days  
Mortgage Notes Payable [Member] | Fixed-rate debt [Member]    
Debt Instrument [Line Items]    
Encumbered Properties | property 653  
Gross Carrying Value of Collateralized Properties $ 5,991,403,000  
Outstanding Balance $ 3,031,644,000  
Weighted-Average Interest Rate 5.08%  
Mortgage Notes Payable [Member] | Fixed-rate debt [Member] | Interest Rate Swap [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 248,100,000  
Mortgage Notes Payable [Member] | Fixed-rate debt [Member] | Weighted-Average [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 5 years 1 month 6 days  
Mortgage Notes Payable [Member] | Variable-rate debt [Member]    
Debt Instrument [Line Items]    
Encumbered Properties | property 1  
Gross Carrying Value of Collateralized Properties $ 24,651,000  
Outstanding Balance $ 8,238,000  
Weighted-Average Interest Rate 3.19%  
Mortgage Notes Payable [Member] | Variable-rate debt [Member] | Weighted-Average [Member]    
Debt Instrument [Line Items]    
Weighted-Average Years to Maturity 8 months 1 day  
Mortgage Notes Payable [Member] | Recourse debt [Member] | Unconsolidated Joint Ventures [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 0