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Dispositions and Held for Sale - Dispositions (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) outparcel | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) outparcel | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gross Sales Price |  | $ 32,208 |  | $ 32,208 |  |  |
Net Sales Price |  | 31,562 |  | 31,562 |  |  |
Gain |  |  |  | 3,236 |  |  |
Gain on Extinguishment of Debt |  | 0 | $ 0 | 71,722 | $ 0 |  |
Loss on impairment |  | 41,608 | $ 51,983 | 66,433 | 70,044 |  |
Gain (loss) on sale of outparcels |  | $ 2,100 |  | $ 2,100 |  |  |
Number of outparcels sold | outparcel |  | 1 |  | 1 |  |  |
Gain related to land contributed |  | $ 433 |  | $ 433 |  |  |
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 |  |  |
Proceeds from sale of real estate |  |  |  | 4,000 |  |  |
Cary Towne Center |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  | $ 54,678 |
Non-cash default interest expense |  |  |  | 237 |  |  |
Proceeds from sale of real estate |  |  |  | 31,500 |  |  |
Malls |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Loss on impairment |  |  |  |  | $ 70,044 |  |
Malls | Honey Creek Mall |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gross Sales Price | $ 14,600 |  |  |  |  |  |
Net Sales Price | 14,360 |  |  |  |  |  |
Gain |  |  |  | 0 |  |  |
Loss on impairment | (239) |  |  | 2,284 |  |  |
Malls | Shops at Hickory Point |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gross Sales Price | 2,508 |  |  |  |  |  |
Net Sales Price | $ 2,407 |  |  |  |  |  |
Gain |  |  |  | 1,326 |  |  |
All Other | Courtyard by Marriott at Pearland Town Center |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gross Sales Price |  | 15,100 |  | 15,100 |  |  |
Net Sales Price |  | 14,795 |  | 14,795 |  |  |
Gain |  |  |  | 1,910 |  |  |
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 |  |  |
Non-recourse loans on operating properties | Malls | Cary Towne Center |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Balance of Non-recourse Debt |  | 43,716 |  | 43,716 |  |  |
Gain on Extinguishment of Debt |  |  |  | 9,926 |  |  |
Restatement Adjustment |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gain (loss) on sale of outparcels |  | $ (242) |  | $ (14) |  |  |

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