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Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |
Interest expense, related party | $ 8,731 | $ 8,973 | $ 10,515
Due (to) from affiliates | 82,162 | 68,227 |
Related Parties Note Receivable, RED Consolidated Holdings, LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Due (to) from affiliates | $ 4,796 | 5,593 |
Notes receivable interest rate | 5.25% |  |
Interest earned | $ 268 | 366 | 520
Northwestern Mutual Life (NML) |  |  |
Related Party Transaction [Line Items] |  |  |
Interest expense payable, related party | 716 | 736 |
Unconsolidated joint ventures |  |  |
Related Party Transaction [Line Items] |  |  |
Due (to) from affiliates | 5,411 | (6,809) |
Affiliated entity | Notes receivable | Fashion Outlets of San Francisco |  |  |
Related Party Transaction [Line Items] |  |  |
Interest earned | 2,513 | 2,234 | $ 1,872
Note receivable | $ 71,955 | $ 69,443 |
Affiliated entity | Notes receivable | Fashion Outlets of San Francisco | LIBOR |  |  |
Related Party Transaction [Line Items] |  |  |
Notes receivable interest rate | 2.00% |  |

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