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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 132,932 | $ 94,132 | $ 261,960 | $ 173,908
Investment management fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 103,168 | 74,062 | 203,644 | 133,333
Open-end funds |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 57,192 | 39,186 | 111,566 | 69,712
Closed-end funds |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,168 | 11,174 | 20,547 | 22,253
Retail separate accounts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 17,091 | 12,759 | 33,620 | 24,192
Institutional accounts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15,778 | 8,790 | 31,596 | 13,931
Structured products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,068 | 1,163 | 4,394 | 1,662
Other products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 871 | 990 | 1,921 | 1,583
Distribution and service fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13,549 | 10,439 | 26,156 | 21,222
Administration and shareholder service fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15,967 | 9,476 | 31,705 | 18,457
Other income and fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 248 | $ 155 | $ 455 | $ 896

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