Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2011	Sep. 30, 2011 ReportableSegment sqft Property Store Loan	Sep. 30, 2010 ReportableSegment Property sqft	Sep. 30, 2011 Year Entity Property ReportableSegment sqft Store Loan	Sep. 30, 2010 Entity sqft Property ReportableSegment	Dec. 31, 2010 sqft Property Store Loan	Dec. 31, 2009 Property
Balance sheet relating to asset held for sale
Land		$ 994		$ 994
Building		11,636		11,636
Fixtures and tenant improvements		2,721		2,721
Carrying amount of real estate assets held for sale		15,351		15,351
Less: Accumulated depreciation		(9,067)		(9,067)
Total assets held for sale		6,284		6,284
Operating results relating to assets sold or designated as held for sale
Revenues		1,563	7,890	10,782	27,201
Expenses:
Operating expenses		109	3,571	3,640	14,638
Impairment charges		2,389	7,062	11,272	83,745
Interest, net		500	4,234	3,695	14,909
Depreciation and amortization		474	2,440	3,495	9,899
Total expenses		3,472	17,307	22,102	123,191
Loss from discontinued operations		(1,909)	(9,417)	(11,320)	(95,990)
Gain on deconsolidation of interests, net	4,700	4,716	5,221	4,716	5,221
(Loss) gain on disposition of real estate, net of tax		(8,033)	889	(15,052)	(2,602)
Net income (loss)		$ (5,226)	$ (3,307)	$ (21,656)	$ (93,371)
Discontinued Operations (Textuals) [Abstract]
Number of assets held for sale		1		1			2
Number of properties sold		21	31	21	31	31
Properties aggregate square feet		1,900,000	2,900,000	1,900,000	2,900,000
Other properties deconsolidated for accounting purpose		26		26		26
Properties aggregate square feet of deconsolidated joint venture		2,300,000		2,300,000		2,300,000