NOTES RECEIVABLE Schedule of Notes Receivable (Details) (USD $)	6 Months Ended			1 Months Ended				1 Months Ended														6 Months Ended																				6 Months Ended
	Jun. 30, 2013 loan	Jun. 30, 2012	Dec. 31, 2012	Jan. 31, 2013 Fund III	Feb. 28, 2013 Brooklyn, New York Fund III	Dec. 31, 2012 Brooklyn, New York Fund III	Apr. 30, 2012 Brooklyn, New York Fund III	Mar. 31, 2013 Construction Loans	Jun. 30, 2013 First Mortgage Loan, 9% Loan Due 2013		Dec. 31, 2012 First Mortgage Loan, 9% Loan Due 2013	Jun. 30, 2013 First Mortgage Loan, 6% Loan Due 2013		Dec. 31, 2012 First Mortgage Loan, 6% Loan Due 2013	Jun. 30, 2013 First Mortgage Loan, 8% Loan Due 2013		Dec. 31, 2012 First Mortgage Loan, 8% Loan Due 2013	Jun. 30, 2013 Mezzanine Loan, 10% Due 2013		Dec. 31, 2012 Mezzanine Loan, 10% Due 2013		Jun. 30, 2013 First Mortgage Loan, 11% Loan Due 2014		Dec. 31, 2012 First Mortgage Loan, 11% Loan Due 2014	Jun. 30, 2013 Zero Coupon Loan		Dec. 31, 2012 Zero Coupon Loan		Jun. 30, 2013 Mezzanine Loan, 15% Due 2020		Dec. 31, 2012 Mezzanine Loan, 15% Due 2020	Jun. 30, 2013 Mezzanine Loan Due With Capital Event		Dec. 31, 2012 Mezzanine Loan Due With Capital Event		Jun. 30, 2013 First Mortgage Loan, 5.3% Due On Demand		Dec. 31, 2012 First Mortgage Loan, 5.3% Due On Demand	Jun. 30, 2013 Construction Loan, 20.5% Due 2012		Dec. 31, 2012 Construction Loan, 20.5% Due 2012	Jun. 30, 2013 Individually Less Than 3 Percent, Variable Interest Rate Due 2013 to Capital Event loan	Dec. 31, 2012 Individually Less Than 3 Percent, Variable Interest Rate Due 2013 to Capital Event	Jun. 30, 2013 Individually Less Than 3 Percent, Variable Interest Rate Due 2013 to Capital Event Minimum		Jun. 30, 2013 Individually Less Than 3 Percent, Variable Interest Rate Due 2013 to Capital Event Maximum
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans On Real Estate, Net Carrying Amount	$ 105,500,000
Mortgage Loans on Real Estate, Number of Loans																																										3
Mortgage Loans on Real Estate, Number of Non-Performing Loans	6																																									2
Mortgage Loans on Real Estate, Face Amount of Mortgages							23,000,000																																			5,700,000
Mortgage Loans on Real Estate, Face Amount of Mortgages, Reserved																																										3,900,000
Effective interest rate									12.00%	[1]		6.00%	[1]		8.00%	[1]		10.00%	[1],[2]			11.00%	[1]		24.00%	[1],[3]			15.00%	[1]		15.00%	[1],[4]			5.30%	[1]		20.50%	[1]				11.00%	[1]	17.50%	[1]
Prior liens									0			0			0			85,835,000	[2]			0			166,200,000	[3]			0			13,265,000	[4]			0			0			37,623,000
Carrying amount of mortgages	105,484,000		129,278,000			18,500,000			12,204,000		12,333,000	10,250,000		10,250,000	8,000,000		8,000,000	9,089,000	[2]	9,089,000	[2]	25,000,000		25,000,000	4,196,000	[3]	3,961,000	[3]	30,879,000		30,879,000	3,834,000	[4]	3,834,000	[4]	0		18,500,000	0		5,400,000	2,032,000	2,032,000
Proceeds from notes receivable	5,529,000	2,004,000		2,500,000	13,000,000
Mortgage Loans on Real Estate, Collections of Principal								5,400,000
Mortgage Loans on Real Estate, Nonperforming Loans, Amount	18,600,000
Period of extension options, second period (in months)																						6 months
Notes receivable, net	105,484,000		129,278,000
Financing Receivable, Allowance for Credit Losses	$ 3,889,000		$ 3,681,000

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

[2] Comprised of three cross-collateralized loans from one borrower, which are non-performing

[3] The principal balance for this accrual only loan is increased by the interest accrued

[4] Non-performing loan