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Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |  |  |
Due from affiliates | $ 83,275 |  | $ 83,275 |  | $ 82,162
Related parties note receivable, RED Consolidated Holdings, LLC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due from affiliates | $ 4,114 |  | $ 4,114 |  | 4,796
Note receivable, interest rate | 5.25% |  | 5.25% |  |
Interest income, related party | $ 57 | $ 68 | $ 117 | $ 138 |
Northwestern Mutual Life (NML) |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Interest expense, related party | 2,131 | 2,181 | 4,278 | 4,392 |
Interest expense payable, related party | 705 |  | 705 |  | 716
Joint Venture | Financing Arrangement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Interest expense | (4,893) |  | 3,129 |  |
Unconsolidated Joint Ventures |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due from affiliates | 5,683 |  | 5,683 |  | 5,411
Affiliated Entity | Notes Receivable | Fashion Outlets of San Francisco |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Interest income, related party | 773 | $ 607 | 1,522 | $ 1,218 |
Note receivable | $ 73,478 |  | $ 73,478 |  | $ 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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