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Sale and Disposal of Properties, Discontinued Operations and Impairment ( Details)				3 Months Ended	9 Months Ended
	Jan. 13, 2015 USD ($)	Feb. 03, 2014 USD ($) property	Dec. 31, 2013 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Sale and Disposal of Properties, Discontinued Operations and Impairment
Net proceeds from sale of real estate					$ 16,025,000	$ 5,177,000
Impairment charge				$ 1,093,000		1,093,000
Income from discontinued operations						13,000
Property located in Cherry Hill, NJ | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Consolidated JV
Sale and Disposal of Properties, Discontinued Operations and Impairment
Net proceeds from sale of real estate	$ 16,025,000
Gain (loss) on sale of property	5,392,000
Mortgage balance paid off	7,376,000
Swap termination expense	472,000
Write-off of deferred financing costs	249,000
Property located in Cherry Hill, NJ | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Consolidated JV | Non-Controlling Interests in Joint Ventures
Sale and Disposal of Properties, Discontinued Operations and Impairment
Non-controlling interest's share of income from the transaction	$ 1,320,000
Property located in Michigan. | Discontinued Operations, Disposed of by Sale
Sale and Disposal of Properties, Discontinued Operations and Impairment
Net proceeds from sale of real estate		$ 5,177,000
Number of properties under contract of sale | property		2
Impairment charge			$ 61,700
Income from discontinued operations						13,000
Rental income						141,000
Real estate expenses						17,000
Mortgage interest						111,000
Property located in Morrow, Georgia.
Sale and Disposal of Properties, Discontinued Operations and Impairment
Impairment charge				$ 1,093,000		$ 1,093,000

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