NOTES RECEIVABLE AND PREFERRED EQUITY INVESTMENTS, NET Schedule of Notes Receivable (Details) (USD $)	1 Months Ended	9 Months Ended			1 Months Ended																											1 Months Ended										1 Months Ended									9 Months Ended								1 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 loan	Sep. 30, 2013	Dec. 31, 2013	Apr. 30, 2014 152-154 Spring Street	Sep. 30, 2014 Construction Loan, 7.0% Percent, Due 2015		Dec. 31, 2013 Construction Loan, 7.0% Percent, Due 2015	Sep. 30, 2014 First Mortgage Loan, 6% Loan Due On Demand		Dec. 31, 2013 First Mortgage Loan, 6% Loan Due On Demand	Sep. 30, 2014 Mezzanine Loan, 10% Due On Demand borrower loan		Dec. 31, 2013 Mezzanine Loan, 10% Due On Demand		Sep. 30, 2014 First Mortgage Loan, 5.5% Loan Due 2016		Dec. 31, 2013 First Mortgage Loan, 5.5% Loan Due 2016	Sep. 30, 2014 Zero Coupon Loan		Dec. 31, 2013 Zero Coupon Loan		Sep. 30, 2014 Mezzanine Loan, 15% Due 2020		Dec. 31, 2013 Mezzanine Loan, 15% Due 2020	Sep. 30, 2014 Mezzanine Loan Due Upon Capital Event		Dec. 31, 2013 Mezzanine Loan Due Upon Capital Event	Sep. 30, 2014 Preferred Equity, 8.1% Loan, Due 2017		Dec. 31, 2013 Preferred Equity, 8.1% Loan, Due 2017	Jul. 31, 2014 Mezzanine Loan, 12.7% Loan, Due 2015	Sep. 30, 2014 Mezzanine Loan, 12.7% Loan, Due 2015		Apr. 30, 2014 Mezzanine Loan, 12.7% Loan, Due 2015	Dec. 31, 2013 Mezzanine Loan, 12.7% Loan, Due 2015	Sep. 30, 2014 Preferred Equity, 13.5% Loan, Due 2016		May 31, 2014 Preferred Equity, 13.5% Loan, Due 2016		Dec. 31, 2013 Preferred Equity, 13.5% Loan, Due 2016	Jul. 31, 2014 Other Loan, 2.5% Plus LIBOR Variable Interest Rate, Due 2020	Sep. 30, 2014 Other Loan, 2.5% Plus LIBOR Variable Interest Rate, Due 2020	Dec. 31, 2013 Other Loan, 2.5% Plus LIBOR Variable Interest Rate, Due 2020	Sep. 30, 2014 Other Loan, 2.5% Plus LIBOR Variable Interest Rate, Due 2020 LIBOR	Sep. 30, 2014 Other Loan, 18%, Due 2017		Jul. 31, 2014 Other Loan, 18%, Due 2017		Dec. 31, 2013 Other Loan, 18%, Due 2017	Sep. 30, 2014 Individually Less Than 3 Percent, Variable Interest Rate loan		Dec. 31, 2013 Individually Less Than 3 Percent, Variable Interest Rate		Sep. 30, 2014 Individually Less Than 3 Percent, Variable Interest Rate Minimum		Sep. 30, 2014 Individually Less Than 3 Percent, Variable Interest Rate Maximum		Jan. 31, 2014 First Mortgage Loan, 8.0% Loan Due 2013	Apr. 30, 2014 Mezzanine Loan	Jan. 31, 2014 Mezzanine Loan	Apr. 30, 2014 Mezzanine Loan LIBOR	Apr. 30, 2014 Mortgage Loan, Libor Plus 3.75% Loan, Due 2024
Mortgage Loans on Real Estate [Line Items]
Net carrying amount	$ 94,400,000	$ 94,400,000
Effective interest rate						7.70%	[1]		6.00%	[1]		10.00%	[1],[2]			5.50%	[1]		24.00%	[1],[3]			15.00%	[1]		15.00%	[1]		8.10%	[1]			12.70%	[1]	12.70%		13.50%	[1]	13.50%	[1]						18.00%	[1]	18.00%	[1]						2.70%	[1]	11.60%	[1]
First Priority liens						0			0			83,686,000	[2]			0			166,200,000	[3]			0			0			20,855,000				18,900,000				0						0			0					0	[4]
Net carrying amounts of notes receivable	94,409,000	94,409,000		126,656,000		12,000,000		12,000,000	0		6,400,000	7,895,000	[2]	9,089,000	[2]	4,000,000		42,000,000	4,847,000	[3]	4,431,000	[3]	30,879,000		30,879,000	0		3,834,000	13,000,000		13,000,000		8,000,000		13,000,000	0	4,000,000		4,000,000		0	4,000,000	4,000,000	3,000,000		3,157,000		4,800,000		0	2,631,000	[4]	2,023,000	[4]						8,500,000			1,900,000
Loans receivable, basis spread on variable rate																																													2.50%																	3.75%
Number of cross collateralized loans												3
Number of borrowers												1
Number of loans																																																			3
Collection of notes receivable	1,900,000	18,095,000	15,779,000																													5,000,000																											6,400,000	10,300,000	1,400,000
Mortgage loans on real estate, collections of principal	1,200,000																																																												700,000
Mortgage Loans On Real Estate, Collections Of Interest	700,000
Income related to the payoff of notes receivable																																																													700,000
Mortgage loans on real estate, exchange of mortgage for investment					38,000,000
Mortgage loans on real estate, write-down or reserve, amount																																																												2,000,000
Mortgage loans on real estate, additional loan																																										1,000,000
Number of non-performing loans		3
Mortgage loans on real estate, nonperforming loans, amount	7,900,000	7,900,000
Mortgage loans on real estate, nonperforming loans, write-down or reserve amount	$ 100,000	$ 100,000

[1] 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] Consists of three loans as of September 30, 2014