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Discontinued Operations and Properties Held for Sale (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012 property	Jun. 30, 2011	Jun. 30, 2012 property	Jun. 30, 2011	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties	120		120
Assets held for sale, net	$ 1,412,000		$ 1,412,000		$ 1,818,000
Operating Loss for Properties Held for Sale	77,000	0	399,000	0
Impairment Loss on Properties Held For Sale	100,000		15,000
Real Estate [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale, net	1,400,000		1,400,000
Operating Loss for Properties Held for Sale	$ 2,000		$ 400,000
Vacant [Member] \| Real Estate [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties	2		2

Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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