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Debt (Aggregate Principal Repayments on Mortgage Notes and Other Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total $ 8,966,996 $ 10,513,781
Mortgage Notes Payable [Member]    
Debt Instrument [Line Items]    
October 1, 2015 - December 31, 2015 3,738  
2016 243,978  
2017 449,073  
2018 210,948  
2019 286,379  
Thereafter 2,039,159  
Total 3,233,275  
Outstanding Balance 3,233,275 $ 3,689,796
Mortgages Secured by Properties Held for Sale [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 124,300