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Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |  |  |
Related parties | $ 1,074 | $ 2,175 | $ 8,481 | $ 6,567 |
Due from affiliates | 87,670 |  | 87,670 |  | $ 82,162
Related parties note receivable, RED Consolidated Holdings, LLC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due from affiliates | $ 3,903 |  | $ 3,903 |  | 4,796
Note receivable, interest rate | 5.25% |  | 5.25% |  |
Interest income, related party | $ 55 | 66 | $ 172 | 204 |
Northwestern Mutual Life (NML) |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Interest expense, related party | 2,102 | 2,175 | 6,380 | 6,567 |
Interest expense payable, related party | 699 |  | 699 |  | 716
Joint Venture | Financing Arrangement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related parties | (1,028) | 0 | 2,101 | 0 |
Unconsolidated Joint Ventures |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due from affiliates | 9,482 |  | 9,482 |  | 5,411
Affiliated Entity | Notes Receivable | Fashion Outlets of San Francisco |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Interest income, related party | 808 | $ 621 | 2,330 | $ 1,839 |
Note receivable | $ 74,285 |  | $ 74,285 |  | $ 71,955
Affiliated Entity | Notes Receivable | Fashion Outlets of San Francisco | LIBOR |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Note receivable, interest rate | 2.00% |  | 2.00% |  |

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