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Combined Guarantor Subsidiaries - Dispositions - Summary (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 USD ($) outparcel | Jun. 30, 2018 USD ($) outparcel | Jun. 30, 2019 USD ($) outparcel | Jun. 30, 2018 USD ($) 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 | $ 41,608 | 51,983 | 66,433 | 70,044 |  |
Gain (loss) on sales of real estate assets |  |  | $ 5,755 | 8,118 |  |
Number of outparcels sold | outparcel | 1 |  | 1 |  |  |
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 |  |  |  | 70,044 |  |
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 |  |  | 0 | $ 1,708 |  |
Number of outparcels sold | outparcel |  | 4 |  | 4 |  |
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 |  |  |
Restatement Adjustment | Guarantor Subsidiaries |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (loss) on sales of real estate assets |  | $ (11) |  | $ 0 |  |

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