Quarterly report pursuant to Section 13 or 15(d)

Discontinued Operations (Narrative) (Details)

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Discontinued Operations (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
sqft
property
item
Dec. 31, 2012
Moorestown, New Jersey [Member]
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Number of properties sold 8 3
Area of property sold 1,210,888  
Sales proceeds $ 165,513