FAIR VALUE MEASUREMENTS Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable and preferred equity investments, net	$ 168,931	$ 102,286
Mortgage and other notes payable	1,326,667	1,130,481
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable and preferred equity investments, net	168,931	102,286
Mortgage and other notes payable	$ 1,345,446	$ 1,141,371