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Debt And Lines Of Credit , Table - Maturities and Amortization of debt and lines of credit (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]  
Total Due $ 3,091,282
2015 101,451
2016 88,579
2017 125,076
2018 217,449
2019 332,004
Thereafter 2,226,723
Lines of Credit [Member]  
Debt Instrument [Line Items]  
Total Due 100,344
2015 0
2016 2,889
2017 0
2018 97,455
2019 0
Thereafter 0
Mortgage maturities [Member]  
Debt Instrument [Line Items]  
Total Due 2,246,200
2015 32,688
2016 26,186
2017 64,314
2018 58,078
2019 270,680
Thereafter 1,794,254
Mortgage principal amortization [Member]  
Debt Instrument [Line Items]  
Total Due 554,358
2015 51,878
2016 53,318
2017 54,035
2018 54,575
2019 53,436
Thereafter 287,116
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 144,477
2015 5,645
2016 6,186
2017 6,727
2018 7,341
2019 7,888
Thereafter $ 110,690