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Revenues (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table summarizes revenue by source:
| Years Ended December 31,
(in thousands) | 2019 |  | 2018 |  | 2017 (1)
Investment management fees |  |  |  |  |
Open-end funds | $ | 229,637 |  |  | $ | 231,175 |  |  | $ | 175,260 |
Closed-end funds | 42,199 |  |  | 41,455 |  |  | 44,687 |
Retail separate accounts | 82,999 |  |  | 73,532 |  |  | 54,252 |
Institutional accounts | 96,429 |  |  | 77,711 |  |  | 46,600 |
Structured products | 6,381 |  |  | 9,622 |  |  | 6,302 |
Other products | 3,832 |  |  | 3,526 |  |  | 3,974 |
Total investment management fees | 461,477 |  |  | 437,021 |  |  | 331,075 |
Distribution and service fees | 40,898 |  |  | 50,715 |  |  | 44,322 |
Administration and shareholder service fees | 59,884 |  |  | 63,614 |  |  | 48,996 |
Other income and fees | 987 |  |  | 885 |  |  | 1,214 |
Total revenues | $ | 563,246 |  |  | $ | 552,235 |  |  | $ | 425,607 |
(1) Prior period amounts have not been adjusted and are reported in accordance with historical accounting under ASC 605, Revenue Recognition

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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