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Debt (Aggregate Principal Repayments on Mortgage Notes and Other Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total	$ 7,802,565	$ 8,059,802
Mortgage Notes Payable [Member]
Debt Instrument [Line Items]
April 1, 2016 - December 31, 2016	198,991
2017	412,546
2018	211,026
2019	231,461
2020	284,197
Thereafter	1,629,082
Total	2,967,303
Mortgage notes in connection with default from non-recourse loan	$ 38,100		$ 38,100	$ 53,800