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Concentration Of Credit Risk	12 Months Ended
	Dec. 31, 2015
Concentration Of Credit Risk [Abstract]
Concentration Of Credit Risk	Note 6. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents in excess of insured amounts and tenant receivables. The Company places its cash and cash equivalents with high quality financial institutions. Management performs ongoing credit evaluations of its tenants and requires certain tenants to provide security deposits and/or suitable guarantees.  Excluding properties held for sale, Giant Food Stores, LLC and Stop & Shop, Inc., each of which is owned by Ahold N.V., a Netherlands corporation, accounted for an aggregate of approximately 12%,  14% and 15% of the Company’s total revenues during 2015, 2014 and 2013, respectively. The Company’s properties are located largely in the region straddling the Washington DC to Boston corridor, which exposes it to greater economic risks than if the properties it owned were located in a greater number of geographic regions (in particular, 27 of the Company’s properties are located in Pennsylvania).

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- Definition

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6327-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6442-108592

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611

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- References

No definition available.

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