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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 552,235 | $ 425,607 | $ 322,554
Total investment management fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 437,021 | 331,075 | 235,230
Open-end funds |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 231,175 | 175,260 | 129,542
Closed-end funds |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 41,455 | 44,687 | 43,342
Retail separate accounts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 73,532 | 54,252 | 40,155
Institutional accounts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 77,711 | 46,600 | 18,707
Structured products |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 9,622 | 6,302 | 2,211
Other products |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,526 | 3,974 | 1,273
Distribution and service fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 50,715 | 44,322 | 48,250
Administration and shareholder service fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 63,614 | 48,996 | 38,261
Other income and fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 885 | $ 1,214 | $ 813

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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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