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Combined Guarantor Subsidiaries - Dispositions - Summary (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) outparcel | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) outparcel | Sep. 30, 2019 USD ($) outparcel | Sep. 30, 2018 USD ($) outparcel | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain on Extinguishment of Debt | $ 0 |  | $ 0 |  | $ 71,722 | $ 0 |  |
Loss on impairment | $ 135,688 |  | 14,600 |  | 202,121 | 84,644 |  |
Gain (loss) on sales of real estate assets |  |  |  |  | $ 13,811 | 15,998 |  |
Number of outparcels sold | outparcel | 2 |  |  |  | 3 |  |  |
Acadania Mall |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  | $ 1,593 | $ 43,007
Non-cash default interest expense |  | $ 305 |  |  |  |  |  |
Malls |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  | 84,644 |  |
Non-recourse loans on operating properties |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Balance of Non-recourse Debt | $ 163,476 |  |  |  | $ 163,476 |  |  |
Gain on Extinguishment of Debt |  |  |  |  | 71,722 |  |  |
Non-recourse loans on operating properties | Malls | Acadania Mall |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Balance of Non-recourse Debt | 119,760 |  |  |  | 119,760 |  |  |
Gain on Extinguishment of Debt |  |  |  |  | 61,796 |  |  |
Guarantor Subsidiaries |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain on Extinguishment of Debt | 0 |  | 0 |  | 61,796 | 0 |  |
Loss on impairment | 0 |  | $ 0 |  | 22,770 | 0 |  |
Gain (loss) on sales of real estate assets |  |  |  | $ 698 | 20 | $ 2,406 |  |
Number of outparcels sold | outparcel |  |  |  | 1 |  | 5 |  |
Guarantor Subsidiaries | Restatement Adjustment |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate assets |  |  |  | $ 0 |  |  |  |
Guarantor Subsidiaries | Acadania Mall |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  | $ 43,007
Non-cash default interest expense |  | $ 305 |  |  |  |  |  |
Guarantor Subsidiaries | Non-recourse loans on operating properties | Malls | Acadania Mall |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Balance of Non-recourse Debt | $ 119,760 |  |  |  | 119,760 |  |  |
Gain on Extinguishment of Debt |  |  |  |  | $ 61,796 |  |  |

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