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Dispositions and Held for Sale - Summary (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain on Extinguishment of Debt | $ 71,722 | $ 0 |  |
Loss on impairment | 24,825 | $ 18,061 |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
Gain on Extinguishment of Debt | $ 9,926 |  |  |

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