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Revenues - Financial Statement Impact of Adopting ASC 606 (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenues | $ 129,028 | $ 79,776
Distribution and other asset-based expenses | 22,291 | 15,323
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Distribution and other asset-based expenses | 21,055 |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Distribution and other asset-based expenses | 1,236 |
Distribution and service fees |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenues | 12,607 | $ 10,783
Distribution and service fees | Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenues | 11,371 |
Distribution and service fees | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenues | $ 1,236 |

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