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Debt And Lines Of Credit , Table - Maturities and Amortization of debt and lines of credit (Details)
$ in Thousands
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]  
Total Due $ 2,303,332
2015 154,772
2016 138,275
2017 91,918
2018 107,718
2019 127,023
Thereafter 1,683,626
Lines of Credit [Member]  
Debt Instrument [Line Items]  
Total Due 25,000
2015 0
2016 0
2017 0
2018 0
2019 25,000
Thereafter 0
Mortgage maturities [Member]  
Debt Instrument [Line Items]  
Total Due 1,695,080
2015 106,830
2016 95,599
2017 48,317
2018 64,314
2019 58,078
Thereafter 1,321,942
Mortgage principal amortization [Member]  
Debt Instrument [Line Items]  
Total Due 396,909
2015 31,304
2016 36,754
2017 37,136
2018 36,382
2019 36,303
Thereafter 219,030
Aspen and Series B-3 Preferred OP Units [Member]  
Debt Instrument [Line Items]  
Total Due 45,903
2015 11,240
2016 0
2017 0
2018 0
2019 0
Thereafter 34,663
Secured borrowing [Member]  
Debt Instrument [Line Items]  
Total Due 140,440
2015 5,398
2016 5,922
2017 6,465
2018 7,022
2019 7,642
Thereafter $ 107,991