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Disposed Assets - Narrative (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) Property | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) Property Properties | Sep. 30, 2016 USD ($) Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from sale of investment properties, net |  |  |  | $ 162,512 | $ 1,533,492
Gain on sale of investment properties, net |  | $ 7,253 | $ 29,586 | $ 21,634 | 105,998
Number of surrendered properties | Property |  |  |  | 1,000 |
Gain on extinguishment of debt |  | (41) | (4,645) | $ 840 | (10,317)
Gain on sale of assets |  | $ 10,115 | $ 10,494 | 10,115 | $ 235,780
Intech Retail [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain on extinguishment of debt |  |  |  | 882 |
Worldgate Plaza |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gross disposition price | $ 53,500 |  |  |  |
Gain on sale of assets |  |  |  | $ 10,115 |
Non-core |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of disposed assets | Properties |  |  |  | 1 | 1
Retail |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of disposed assets | Properties |  |  |  | 6 | 24
Retail | Non-core |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gross disposition price |  |  |  | $ 206,130 | $ 1,887,550
Assets Surrendered |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of surrendered properties | Property |  | 1 |  |  |

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- Definition Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721525-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e957-107759 + Details
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