ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Business Interruption Insurance Deductible			$ 100,000
Impairment of asset	0		6,925,000	0
Provision for Insurance Deductible Attributable to Loss of Rents			100,000
Insurance proceeds from involuntary conversion of asset	3,672,000		0	0
Insurance proceeds from involuntary conversion of asset, other			6,900,000
Gain on involuntary conversion of asset	2,368,000		0	0
Deferred Rent Receivables, Net	25,700,000		22,800,000
Allowance for Doubtful Accounts Receivable	6,100,000		5,300,000
Allowance for Notes, Loans and Financing Receivable	3,681,000		3,276,000	3,036,000
Required Distribution Rate to Maintain REIT Status (in percent)	90.00%
Loss of Anchor Tenant [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Allowance for Notes, Loans and Financing Receivable	400,000
Flood [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Impairment of asset			1,400,000
Funiture, Fixtures and Equipment [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Property, Plant and Equipment, Useful Life, Minimum (In Years)	5 years
Minimum [Member] | Building [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Property, Plant and Equipment, Useful Life, Minimum (In Years)	30 years
Maximum [Member] | Building [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Property, Plant and Equipment, Useful Life, Minimum (In Years)	40 years
Operating Partnership, as General Partner or Managing Member [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership Interest By General Partner or Managing Partner (in percent)	99.00%
Remaining Funds Rate of Distribution to Operating Partnership (in percent)	20.00%
Institutional Investors [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Remaining Funds Rate of Distribution to All Partners (in percent)	80.00%
Fund I and Mervyns I [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership Interest By General Partner or Managing Partner (in percent)	37.78%	[1]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Share of Capital	22.22%	[1]
General Partners' Contributed Capital	90,000,000	[1]
Managing Members' Contributed Capital	86,600,000	[1]
Limited Liability Company Llc Or Limited Partnership Lp Members Or Limited Partners, Preferred Return	9.00%	[1]
Partners' Capital Account, Distributions	86,600,000	[1]
Fund I [Member] | Granville Centre [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Impairment of asset	7,000,000		6,900,000
Fund I [Member] | Operating Partnership, as General Partner or Managing Member [Member] | Granville Centre [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Impairment of asset			1,500,000
Fund II and Mervyns II [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership Interest By General Partner or Managing Partner (in percent)	20.00%
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Share of Capital	20.00%
General Partners' Contributed Capital	300,000,000
Managing Members' Contributed Capital	300,000,000
Limited Liability Company Llc Or Limited Partnership Lp Members Or Limited Partners, Preferred Return	8.00%
Partners' Capital Account, Distributions	84,500,000
Fund III [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership Interest By General Partner or Managing Partner (in percent)	19.90%
General Partners' Committed Capital	502,500,000
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Share of Capital	19.90%
General Partners' Contributed Capital	475,000,000	[2]
Managing Members' Contributed Capital	341,000,000
Limited Liability Company Llc Or Limited Partnership Lp Members Or Limited Partners, Preferred Return	6.00%
Partners' Capital Account, Distributions	164,000,000
Mervyns I and Mervyns II [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Impairment of asset	2,000,000
Fund IV [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership Interest By General Partner or Managing Partner (in percent)	23.12%
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Share of Capital	23.12%
General Partners' Contributed Capital	540,600,000
Managing Members' Contributed Capital	64,600,000
Limited Liability Company Llc Or Limited Partnership Lp Members Or Limited Partners, Preferred Return	6.00%
Partners' Capital Account, Distributions	$ 0
Core Portfolio [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of Retail Properties	72
Properties Owned Percentage	100.00%
Opportunity Funds [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of Retail Properties	28

[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.

[2] Original committed capital of Fund III was $502.5 million. During 2012, this amount was reduced to $475.0 million.