FAIR VALUE MEASUREMENTS Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable and preferred equity investments, net	$ 154,679	$ 147,188
Mortgage and other notes payable	1,296,558	1,358,606
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable and preferred equity investments, net	154,679	147,188
Mortgage and other notes payable	$ 1,323,937	$ 1,382,318