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Discontinued Operations and Properties Held for Sale (Details) (USD $)	1 Months Ended	3 Months Ended								12 Months Ended		0 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Jul. 03, 2012 Property in Havertown, PA [Member]	Dec. 31, 2012 Vacant [Member] Real Estate [Member] property	Dec. 31, 2011 Vacant [Member] Real Estate [Member] property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on held for sale properties	$ 0									$ 100,000	$ (815,000)
Number of Real Estate Properties													1	2
Proceeds from sale of property held for sale	0									553,000	0	600,000
Gain (Loss) on Sale of Property										500,000
Assets held for sale		665,000				1,818,000				665,000	1,818,000
Operating Loss for Properties Held for Sale	$ 0	$ 259,000	$ 41,000	$ 77,000	$ 322,000	$ 808,000	$ 8,000	$ 0	$ 0	$ 699,000	$ 816,000

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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