ACQUISITION AND DISPOSITION OF PROPERTIES AND DISCONTINUED OPERATIONS Dispositions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 sqft
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price	$ 445,678
Gain (Loss)	74,605
GLA (in square feet)	398,874.00
White Oak [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price	13,778	[1]
Gain (Loss)	3,402	[1]
GLA (in square feet)	64,600.00	[1]
Tarrytown Centre [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price	12,800
Gain (Loss)	2,935
GLA (in square feet)	35,000.00
125 Main Street, Westport [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price	33,500
Gain (Loss)	5,867
GLA (in square feet)	25,732.00
Canarsie Plaza [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price	124,000
Gain (Loss)	(1,315)
GLA (in square feet)	273,542.00
Self Storage Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price	261,600
Gain (Loss)	$ 63,716
GLA (in square feet)	0

[1] This property was accounted for as an unconsolidated investment.