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Disposed Properties - Narrative (Details) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 30, 2017 USD ($) | May 17, 2017 Property | Dec. 31, 2017 USD ($) Property Properties | Dec. 31, 2016 USD ($) Properties | Dec. 31, 2015 USD ($) Property Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of single-user outparcels | Property |  |  | 2 |  |
Number of parcels of land | Property |  |  |  |  | 1
Proceeds from sale of investment properties, net |  |  | $ 198,243 | $ 1,568,978 | $ 196,583
Gain on sale of investment properties, net |  |  | 24,066 | 117,848 | 40,682
Gain (loss) on extinguishment of debt |  |  | 840 | (10,498) | (4,568)
Gain on sale of properties, net |  |  | $ 10,115 | $ 236,256 | $ 0
Retail Site [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of properties sold | Properties |  |  |  | 28 | 11
Non Core [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of properties sold | Properties |  |  | 1 | 1 | 5
Non Core [Member] | Retail Site [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gross Disposition Price |  |  | $ 244,066 | $ 1,924,350 | $ 196,600
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain on sale of investment properties, net |  |  | 24,066 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Intech Retail [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  | $ 882 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Retail Site [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of properties sold | Properties |  |  | 7 |  |
Gross Disposition Price |  |  | $ 186,380 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Other Property [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of surrendered properties | Property |  | 1 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Non Core [Member] | Single User Outparcel [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gross Disposition Price |  |  | $ 4,186 |  |
Discontinued Operations, Disposed of by Sale [Member] | Worldgate Plaza [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gross Disposition Price | $ 53,500 |  |  |  |

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