MORTGAGES AND OTHER NOTES PAYABLE Summary Mortgage Notes Payable (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended				12 Months Ended			12 Months Ended														12 Months Ended			12 Months Ended			12 Months Ended					12 Months Ended			12 Months Ended			12 Months Ended				12 Months Ended		12 Months Ended			12 Months Ended				12 Months Ended									12 Months Ended					12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2013 properties	Dec. 31, 2012	Dec. 31, 2013 Variable Interest Rate [Member]	Dec. 31, 2012 Variable Interest Rate [Member]	Dec. 31, 2013 Mortgages [Member]	Dec. 31, 2013 Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 Secured Credit Facilities - Variable-Rate [Member] Variable Interest Rate [Member] Fund IV [Member]		Dec. 31, 2012 Secured Credit Facilities - Variable-Rate [Member] Variable Interest Rate [Member] Fund IV [Member]		Dec. 31, 2013 Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 Interest Rate Swap [Member] Variable Interest Rate [Member]		Dec. 31, 2012 Interest Rate Swap [Member] Variable Interest Rate [Member]		Dec. 31, 2013 Interest Rate Swap [Member] Fixed Interest Rate [Member]		Dec. 31, 2012 Interest Rate Swap [Member] Fixed Interest Rate [Member]		Dec. 31, 2013 28 Jericho Turnpike [Member] Mortgages [Member]	Dec. 31, 2013 28 Jericho Turnpike [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 28 Jericho Turnpike [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 Norstrand Avenue [Member] Mortgages [Member]	Dec. 31, 2013 Norstrand Avenue [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 Norstrand Avenue [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 161st St. [Member] Mortgages [Member]	Dec. 31, 2013 City Point Refinance, LIBOR Plus 5% [Member] Mortgages [Member]		Apr. 30, 2013 City Point Refinance, LIBOR Plus 5% [Member] Mortgages [Member]	Mar. 31, 2013 City Point Refinance, LIBOR Plus 5% [Member] Mortgages [Member]	Dec. 31, 2013 60 Orange Street [Member] Mortgages [Member]	Dec. 31, 2013 60 Orange Street [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 60 Orange Street [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 210 Bowery LLC [Member] Mortgages [Member]	Dec. 31, 2013 210 Bowery LLC [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 210 Bowery LLC [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 Cortlandt Towne Center [Member] Mortgages [Member]		Aug. 31, 2013 Cortlandt Towne Center [Member] Mortgages [Member]	Jul. 31, 2013 Cortlandt Towne Center [Member] Mortgages [Member]	Dec. 31, 2013 Cortlandt Towne Center [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 Cortlandt Towne Center [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 Village Commons Shopping Center [Member] Mortgages [Member]	Dec. 31, 2013 Village Commons Shopping Center [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 Village Commons Shopping Center [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 Branch Plaza [Member] Mortgages [Member]	Dec. 31, 2013 West Diversity [Member] Mortgages [Member]	Dec. 31, 2013 West Diversity [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 West Diversity [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 Fordham Place [Member] Mortgages [Member]		Dec. 31, 2013 Pelham Manor [Member] Mortgages [Member]		Dec. 31, 2013 Lincoln Park Centre LLC [Member] Mortgages [Member]	Dec. 31, 2013 Lincoln Park Centre LLC [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 Lincoln Park Centre LLC [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 Lincoln Park Centre LLC [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 Lincoln Park Centre LLC [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 A and P Shopping Center [Member] Mortgages [Member]		Dec. 31, 2013 City Point, 4.75% [Member] Mortgages [Member]	Dec. 31, 2013 City Point, 4.75% [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 City Point, 4.75% [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 161st St., LIBOR Plus 5.67% [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 161st St., LIBOR Plus 5.67% [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 Liberty Avenue [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 Liberty Avenue [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 Branch Shopping Plaza [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 Branch Shopping Plaza [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 640 Broadway [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 640 Broadway [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 Heritage Shops [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 Heritage Shops [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 City Point, LIBOR Plus 3.67% [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 City Point, LIBOR Plus 3.67% [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 City Point, LIBOR Plus 5.17% [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 City Point, LIBOR Plus 5.17% [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 New Hyde Park Shopping Center [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 New Hyde Park Shopping Center [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 Term Loan [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 Term Loan [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 161st St., LIBOR Plus 2.67% [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 161st St., LIBOR Plus 2.67% [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 4401 White Plains [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2012 4401 White Plains [Member] Mortgage Notes Payable - Variable-Rate [Member] Variable Interest Rate [Member]	Dec. 31, 2013 Clark Diversey [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 Clark Diversey [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 New Louden Center [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 New Louden Center [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 City Point [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 City Point [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 Crescent Plaza [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 Crescent Plaza [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 Pacesetter Park Shopping Center [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 Pacesetter Park Shopping Center [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 Elmwood Park Shopping Center [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 Elmwood Park Shopping Center [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 Chicago Street Retail Portfolio [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 Chicago Street Retail Portfolio [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 The Gateway Shopping Center [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 The Gateway Shopping Center [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 River Street [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 River Street [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 Brandywine Town Center [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 Brandywine Town Center [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 Walnut Hill Plaza [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 Walnut Hill Plaza [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 Rhode Island Place Shopping Center [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 Rhode Island Place Shopping Center [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 239 Greenwich Avenue [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 239 Greenwich Avenue [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 639 West Diversey [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 639 West Diversey [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 Merrillville Plaza [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 Merrillville Plaza [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 216th Street [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 216th Street [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2013 City Point, 1% [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]	Dec. 31, 2012 City Point, 1% [Member] Mortgage Notes Payable - Fixed Rate [Member] Fixed Interest Rate [Member]
Debt Instrument [Line Items]
Mortgages Payable	$ 1,037,700	$ 612,400
Number of Properties Collateralized	32
Interest rate, minimum	1.00%
Interest rate, maximum	7.25%
Proceeds from Issuance of Long-term Debt					324,233																	16,500			13,000			29,500	20,000	[1]			8,600			4,600			12,033	[2]					0			0	0				[3]	0	[3]	23,000					0	[3]	197,000
Repayments of debt					207,203																	0			0			28,900	0	[1]			0			0			0	[2]					9,084			12,311	14,905			81,422	[3]	33,555	[3]	19,026					8,000	[3]	0
Mortgages payable	(1,039,617)	(612,251)	(224,041)	(186,056)		(334,951)	(225,863)	(68,750)	[4]	(93,050)	[4]	(813,708)	(426,302)	(179,660)	[5]	(132,857)	[5]	(179,660)	[5]	(132,857)	[5]		(16,164)	0		(12,567)	0				(20,000)	(50,000)		(8,457)	0		(4,600)	0			(85,000)	(73,000)	(84,745)	(73,499)		0	(9,192)			0	(15,273)						(23,000)	0	0	(19,478)				(197,000)	0	0	(28,900)	(9,090)	(9,208)	0	(12,526)	(22,750)	(22,750)	(20,871)	(21,000)	(20,650)	(20,650)	(20,000)	0	(6,294)	(6,484)	(50,000)	0	(29,500)	0	(6,263)	(6,381)	(4,192)	(4,345)	(13,369)	(13,634)	(20,000)	(20,000)	(16,747)	(17,025)	(11,530)	(11,742)	(32,744)	(33,258)	(15,558)	(15,835)	(19,746)	(20,036)	(10,904)	(11,128)	(166,200)	0	(22,910)	(23,194)	(16,208)	(16,426)	(26,000)	(26,000)	(4,341)	(4,431)	(25,837)	(26,151)	(25,500)	(25,500)	(5,262)	(5,262)
Debt Instrument, Interest Rate, Stated Percentage																																																															4.75%
Debt Instrument, Description of Variable Rate Basis								LIBOR														LIBOR	LIBOR		LIBOR	LIBOR		LIBOR	LIBOR				LIBOR	LIBOR		LIBOR	LIBOR		LIBOR				LIBOR			LIBOR				LIBOR						LIBOR	LIBOR									LIBOR		LIBOR		LIBOR		LIBOR		LIBOR		LIBOR		LIBOR		LIBOR		LIBOR		LIBOR		LIBOR
Debt Instrument, Basis Spread on Variable Rate								1.65%														1.90%	1.90%		2.65%	2.65%		2.50%	5.00%				1.90%	1.75%		1.90%	1.95%		2.25%				1.65%			1.40%				1.90%						1.45%	1.45%									5.50%		3.25%		2.25%		2.95%		2.25%		3.50%		5.00%		2.25%		1.40%		2.50%		1.90%
Interest rate at December 31, 2011								1.82%										2.15%	[5]				2.07%			2.82%								1.92%			2.12%						1.82%			1.57%				2.07%							1.62%		5.85%					4.75%		5.67%		3.42%		2.42%		3.12%		2.42%		3.67%		5.17%		2.42%		1.57%		2.67%		2.07%		6.35%		5.64%		7.25%		4.98%		5.12%		5.53%		5.61%		5.44%		5.29%		5.99%		6.06%		6.35%		5.42%		6.65%		5.88%		5.80%		1.00%
Unamortized premium	$ 1,868	$ (107)

[1] Loan was amended from $50.0 million to $20.0 million.

[2] Loan was amended from $73.0 million to $85.0 million.

[3] Loan was paid off in connection with the sale of the property.

[4] The Fund IV revolving subscription line of credit is secured by unfunded investor capital commitments.

[5] Represents the amount of the Company’s variable-rate debt that has been fixed through certain cash flow hedge transactions (Note 10).