FAIR VALUE MEASUREMENTS Fair Value by Balance Sheet Grouping (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Receivable and Preferred Equity Investments	$ 94,409	$ 126,656
Mortgage, Convertible Notes and Other Notes Payable	1,141,066	1,039,997
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Receivable and Preferred Equity Investments	94,409	126,656
Mortgage, Convertible Notes and Other Notes Payable	$ 1,155,499	$ 1,056,457