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MORTGAGES, NOTES AND LOANS PAYABLE (Summary of Mortgages, Notes and Loans Payable) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Deferred Financing Costs $ (11,934) $ (12,392)
Total mortgages, notes and loans payable 2,690,747 2,443,962
Deferred Financing Costs, accumulated amortization 14,300 12,700
Amount of variable-rate debt swapped to fixed rate 182,100 209,500
Secured Debt    
Debt Instrument [Line Items]    
Fixed-rate debt: 1,134,339 1,087,642
Variable-rate debt: 1,524,319 1,314,973
Bonds    
Debt Instrument [Line Items]    
Fixed-rate debt: $ 44,023 $ 53,739