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Revenues - Financial Statement Impact of Adopting ASC 606 (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenues | $ 152,210 | $ 123,675 | $ 414,170 | $ 297,583
Distribution and other asset-based expenses | 25,386 | 20,552 | 71,398 | 51,639
Balance Under Prior ASC 605 | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Distribution and other asset-based expenses | 23,281 |  | 65,963 |
Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Distribution and other asset-based expenses | 2,105 |  | 5,435 |
Distribution and service fees |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenues | 13,730 | $ 11,482 | 39,886 | $ 32,704
Distribution and service fees | Balance Under Prior ASC 605 | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenues | 11,625 |  | 34,451 |
Distribution and service fees | Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenues | $ 2,105 |  | $ 5,435 |

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