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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 152,210 | $ 123,675 | $ 414,170 | $ 297,583
Investment management fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 121,713 | 97,295 | 325,357 | 230,628
Open-end funds |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 62,466 | 51,190 | 174,032 | 120,902
Closed-end funds |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,614 | 11,243 | 31,161 | 33,495
Retail separate accounts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 19,532 | 14,686 | 53,152 | 38,879
Institutional accounts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 24,614 | 16,208 | 56,210 | 30,140
Structured products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,602 | 2,822 | 7,996 | 4,483
Other products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 885 | 1,146 | 2,806 | 2,729
Distribution and service fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13,730 | 11,482 | 39,886 | 32,704
Administration and shareholder service fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 16,567 | 14,699 | 48,272 | 33,156
Other income and fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 200 | $ 199 | $ 655 | $ 1,095

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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