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Discontinued Operations and Assets Held for Sale (Narrative) (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) land_parcel shopping_center | Sep. 30, 2014 USD ($) | Dec. 31, 2014 shopping_center
Schedule of Acquisitions and Dispositions [Line Items] |  |  |
Number of shopping centers sold | 4 |  |
Number of outparcels sold | land_parcel | 2 |  |
Proceeds from sale | $ | $ 41,800 |  |
Gain on sale | $ | 9,224 | $ 16,624 |
Provisions of impairment | $ | $ 800 |  |
Discontinued Operations [Member] |  |  |
Schedule of Acquisitions and Dispositions [Line Items] |  |  |
Number of shopping centers sold |  |  | 34
Discontinued Operations [Member] | Blackstone Advisory Partners L.P. [Member] |  |  |
Schedule of Acquisitions and Dispositions [Line Items] |  |  |
Number of shopping centers sold |  |  | 33

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- Definition The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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