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Dispositions and Held for Sale - Summary (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) outparcel | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sales price, gross |  | $ 48,500 |  |
Sales price, net |  | 37,084 |  |
Gain |  | 5,543 |  |
Gain on sales of real estate assets |  | 15,998 | $ 86,904 |
Held for sale | [1] | $ 14,807 |  | $ 0
Real estate held-for-sale relative to total assets (as a percent) |  | 0.31188% |  |
Outparcel Sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain on sales of real estate assets |  | $ 10,455 |  |
Number of properties disposed | outparcel |  | 10 |  |
Other | Gulf Coast Town Center - Phase III |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sales price, gross |  | $ 9,000 |  |
Sales price, net |  | 8,769 |  |
Gain |  | 2,236 |  |
Other | Statesboro Crossing |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sales price, gross |  | 21,500 |  |
Sales price, net |  | 10,532 |  |
Gain |  | 3,215 |  |
Malls | Janesville Mall |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sales price, gross |  | 18,000 |  |
Sales price, net |  | 17,783 |  |
Gain |  | 0 |  |
Gain (loss) on impairments |  | (18,061) |  |
Malls | Prior sales adjustment |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sales price, gross |  | 0 |  |
Sales price, net |  | 0 |  |
Gain |  | $ 92 |  |
[1] | As of September 30, 2018, includes $621,616 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $414,923 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 6.

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