ACQUISITION AND DISPOSITION OF REAL ESTATE AND DISCONTINUED OPERATIONS Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended	1 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011 Assets	Aug. 31, 2012 Westport, Connecticut 125 Main Street, Westport	Jun. 30, 2012 Westchester, New York Tarrytown Centre sqft
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price	$ 44,703	$ 43,791	$ 65,000	$ 33,500	$ 12,800
Square Footage of Real Estate Property (in square feet)					35,000
Number of Assets Sold (in assets)			18