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Concentration Of Credit Risk (Details) - property | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Concentration Risk [Line Items] |  |  |
Number of properties | 60 |  |
Pennsylvania [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Number of properties | 27 |  |
Revenues [Member] | Ahold N.V. [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of concentration risk | 12.00% | 14.00% | 15.00%

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