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Revenues (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table summarizes investment management fees by source:
| Years Ended December 31,
(in thousands) | 2021 |  | 2020 |  | 2019
Investment management fees |  |  |  |  |
Open-end funds | $ | 393,673 |  |  | $ | 247,519 |  |  | $ | 229,637 |
Closed-end funds | 63,301 |  |  | 36,833 |  |  | 42,199 |
Retail separate accounts | 174,919 |  |  | 104,932 |  |  | 82,999 |
Institutional accounts | 143,487 |  |  | 109,531 |  |  | 96,429 |
Structured products | 4,726 |  |  | 4,012 |  |  | 6,381 |
Other products | 1,479 |  |  | 2,511 |  |  | 3,832 |
Total investment management fees | $ | 781,585 |  |  | $ | 505,338 |  |  | $ | 461,477 |

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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=123351226&loc=SL49130545-203045 + Details
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