Concentration Of Credit Risk	12 Months Ended
Concentration Of Credit Risk	Dec. 31, 2014
Concentration Of Credit Risk [Abstract]
Concentration Of Credit Risk	Note 7. 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 14%, 15% and 14% of the Company’s total revenues during 2014, 2013 and 2012, 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, 26 of the Company’s properties are located in Pennsylvania).

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.

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