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Subsequent Events - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Non-recourse loans on operating properties |  |  |
Subsequent Event [Line Items] |  |  |
Balance of Non-recourse Debt |  | $ 163,476 |
Volusia Mall | Non-recourse loans on operating properties |  |  |
Subsequent Event [Line Items] |  |  |
Interest rate (as a percent) |  | 8.00% |
Volusia Mall | Non-recourse loans on operating properties | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Interest rate (as a percent) | 4.56% |  |
Volusia Mall | Non-recourse loans on operating properties | Malls |  |  |
Subsequent Event [Line Items] |  |  |
Balance of Non-recourse Debt |  | $ 41,000 |
Volusia Mall | Non-recourse loans on operating properties | Malls | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Balance of Non-recourse Debt | $ 50,000 |  |
Honey Creek Mall | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Proceeds from sale of real estate | 14,600 |  |
Honey Creek Mall | Non-recourse loans on operating properties | Malls |  |  |
Subsequent Event [Line Items] |  |  |
Balance of Non-recourse Debt |  | $ 23,700 |
The Shoppes at Hickory Point | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Proceeds from sale of real estate | $ 2,508 |  |
Village Square | Mortgages |  |  |
Subsequent Event [Line Items] |  |  |
Interest Rate (as a percent) |  | 4.00% | 4.00%
Village Square | Mortgages | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Interest Rate (as a percent) | 5.00% |  |
Monthly payment amount | $ 60 |  |

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