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Investment in Unconsolidated Affiliates (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investments in and Advances to Affiliates [Line Items] |  |  |
Company's share in the earnings of LSV | $ 151,891 | $ 159,791 | $ 152,550
Distributions received from LSV | $ 136,820 | 166,941 | 143,517
LSV Asset Management |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Ownership interest in LSV | 38.90% |  |
Total investment in LSV | $ 67,413 |  |
Company's share in the earnings of LSV | 151,891 | 159,791 | 152,550
Distributions received from LSV | $ 136,820 | $ 166,941 | $ 143,517

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