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Combined Guarantor Subsidiaries - Dispositions - Summary (Details) $ in Thousands | 3 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) outparcel | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($)
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 |  |  |
Gain on sales of real estate assets | 228 | 4,371 |  |  |
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 |  |  |  |
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 |  |  |  |
Guarantor Subsidiaries |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain on Extinguishment of Debt | 61,796 | 0 |  |  |
Loss on impairment | 22,770 | 0 |  |  |
Gain on sales of real estate assets | 0 | $ 1,718 |  |  |
Number of outparcels sold | outparcel |  | 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 |  |  |  |
Gain on Extinguishment of Debt | $ 61,796 |  |  |  |

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