ORGANIZATION AND BASIS OF PRESENTATION (Details)	3 Months Ended
	Mar. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of retail properties (in properties)	104
Number of opportunity funds	4
Fund I and Mervyns I
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership interest by general partner or managing partner	37.78%	[1]
Core Portfolio
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of retail properties (in properties)	73
Properties owned, percentage	100.00%
Core Portfolio | Brandywine Portfolio
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Equity method investment, ownership percentage	22.22%
Area of real estate property	1,000,000
Opportunity Funds
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of retail properties (in properties)	31
Operating Partnership, as General Partner or Managing Member
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership interest by general partner or managing partner	99.00%
Remaining funds rate of distribution to partnership	20.00%
Institutional Investors [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Remaining funds rate of distribution to all partners	80.00%

[1] Fund I and Mervyns I have returned all capital and preferred return. The Operating Partnership is now entitled to a Promote on all future cash distributions.