NOTES RECEIVABLE Schedule of Notes Receivable (Details) (USD $)	3 Months Ended			1 Months Ended		1 Months Ended	3 Months Ended								3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Jan. 31, 2013 Fund III	Dec. 31, 2012 Brooklyn, New York Fund III	Mar. 31, 2013 Construction Loans	Mar. 31, 2013 First Mortgage Loan, 9% Loan Due 2013		Mar. 31, 2013 First Mortgage Loan, 6% Loan Due 2013		Mar. 31, 2013 First Mortgage Loan, 8% Loan Due 2013		Mar. 31, 2013 Mezzanine Loan, 10% Due 2013		Mar. 31, 2013 First Mortgage Loan, 11% Loan Due 2014		Mar. 31, 2013 Zero Coupon Loan [Member]		Mar. 31, 2013 Mezzanine Loan, 15% Due 2020		Mar. 31, 2013 Mezzanine Loan Due With Capital Event [Member]		Mar. 31, 2013 Individually Less Than 3 Percent, Variable Interest Rate Due 2013 to Capital Event	Mar. 31, 2013 Individually Less Than 3 Percent, Variable Interest Rate Due 2013 to Capital Event Minimum		Mar. 31, 2013 Individually Less Than 3 Percent, Variable Interest Rate Due 2013 to Capital Event Maximum		Mar. 31, 2013 Two Notes with Interest in Arrears [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans On Real Estate, Net Carrying Amount	$ 105,400,000
Effective interest rate							9.00%	[1]	6.00%	[1]	8.00%	[1]	10.00%	[1]	11.00%	[1]	24.00%	[1]	15.00%	[1]	15.00%	[1]		11.00%	[1]	17.50%	[1]
Prior liens							0		0		0		85,835,000		0		166,200,000		0		13,265,000		37,623,000
Carrying amount of mortgages	105,367,000				18,500,000		12,204,000		10,250,000		8,000,000		9,089,000		25,000,000		4,078,000		30,879,000		3,834,000		2,033,000
Proceeds from notes receivable	5,529,000	3,000		2,500,000
Mortgage Loans on Real Estate, Collections of Principal						5,400,000
Period of extension options (in months)							6 months
Period of extension options, second period (in months)															6 months
Notes receivable, net	$ 105,367,000		$ 129,278,000																									$ 5,600,000

[1] The effective interest rate includes points and exit fees.