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Revenues - Financial Statement Impact of Adopting ASC 606 (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenues | $ 552,235 | $ 425,607 | $ 322,554
Distribution and other asset-based expenses | 92,441 | 71,987 | 69,049
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 | 86,465 |  |
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 | 5,976 |  |
Distribution and service fees |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenues | 50,715 | $ 44,322 | $ 48,250
Distribution and service fees | Balance Under Prior ASC 605 | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenues | 44,739 |  |
Distribution and service fees | Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenues | $ 5,976 |  |

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