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Commitments and Contingencies - Narrative (Details) - Asset management fees - Service Provider - Defendants vs. Service Providers - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Apr. 16, 2018
Loss Contingencies [Line Items] |  |  |
Prepaid management fees |  |  | $ 91
Litigation costs | $ 500 | $ 1,900 |

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