FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS Fair Value by Balance Sheet Grouping (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Receivable and Preferred Equity Investments	$ 126,707	$ 129,278
Mortgage Notes Payable and Convertible Notes Payable	1,039,997	613,181
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Receivable and Preferred Equity Investments	126,707	129,278
Mortgage Notes Payable and Convertible Notes Payable	$ 1,056,457	$ 620,583