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Debt, Commitments and Contingencies - Repurchase of Subsidiary Units (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
Subsidiary unit awards |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Settlements | $ 0 | $ 0 | $ 200 | $ 2,802 |
Founder and President | Repurchase of Subsidiary Units, February 2011 |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due to related parties, current | 100 |  | 100 |  | $ 200
Due to related parties, noncurrent | $ 100 |  | 100 |  | $ 200
Founder and President | Subsidiary unit awards | Repurchase of Subsidiary Units, February 2011 |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Settlements |  |  | $ 200 |  |

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