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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |
Receivables from customers | $ 473 |  | $ 473 |  | $ 778
Affiliated entity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Joint venture partnership percentage | 55.00% |  | 55.00% |  |
Other fee income |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Income | $ 1,068 | $ 965 | $ 2,833 | $ 2,965 |

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