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Investment In Unconsolidated Affiliate (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Apr. 01, 2020 | Mar. 31, 2020
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Distributions received from unconsolidated affiliate |  |  | $ 119,821 | $ 123,663 |  |
Company's share in the earnings of equity method investee | $ 28,305 | $ 37,609 | 86,488 | 112,758 |  |
LSV Asset Management |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  | 38.80% | 38.90%
Total investment in equity method investee | 33,117 |  | 33,117 |  |  |
Distributions received from unconsolidated affiliate |  |  | 119,821 | 123,663 |  |
Company's share in the earnings of equity method investee | $ 28,305 | $ 37,609 | $ 86,488 | $ 112,758 |  |

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