ACQUISITION AND DISPOSITION OF PROPERTIES AND DISCONTINUED OPERATIONS Dispositions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 sqft
Core Portfolio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
GLA (in square feet)	56,004
Core Portfolio [Member] | AP Shopping Plaza [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price	$ 18,400
Gain/(Loss)	6,500
GLA (in square feet)	62,741
Fund II [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price	204,300
Gain/(Loss)	12,314
GLA (in square feet)	981,800
Fund II [Member] | Pelham Storage [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price	11,900
Gain/(Loss)	4,226
GLA (in square feet)	490,900
Fund II [Member] | Fordham Place [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price	133,900
Gain/(Loss)	(806)
GLA (in square feet)	262,407
Fund II [Member] | Pelham Plaza [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price	58,500
Gain/(Loss)	$ 8,894
GLA (in square feet)	228,493