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Property Transactions Property Transactions (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2013 Tiffany Springs MarketCenter Kansas City [Member] sqft | Sep. 30, 2013 Inhibitex Suburban Atlanta [Member] sqft | Dec. 31, 2012 Inhibitex Suburban Atlanta [Member] sqft | Dec. 31, 2012 Avenue Forsyth Suburban Atlanta [Member] sqft | Dec. 31, 2012 The Avenue Collierville [Member] sqft | Dec. 31, 2012 Avenue Webb Gin Suburban Atlanta [Member] sqft | Dec. 31, 2012 Galleria 75 [Member] sqft | Dec. 31, 2012 Cosmopolitan Center [Member] sqft
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Area of Real Estate Property | 238,000 | 51,000 | 51,000 | 524,000 | 511,000 | 322,000 | 111,000 | 51,000
Sales Price of Property Sold Discontinued Operations | $ 53,500 |  |  | $ 119,000 | $ 55,000 | $ 59,600 | $ 9,200 | $ 7,000

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- Details
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