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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 129,028 | $ 79,776
Investment management fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 100,476 | 59,271
Open-end funds |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 54,361 | 30,526
Closed-end funds |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 10,378 | 11,079
Retail separate accounts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 16,529 | 11,434
Institutional accounts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 15,818 | 5,141
Structured products |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,326 | 498
Other products |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,064 | 593
Distribution and service fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 12,607 | 10,783
Administration and shareholder service fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 15,738 | 8,981
Other income and fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 207 | $ 741

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- Definition Amount, including 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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