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Investments - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | $ 26,935 | $ 10,860
Investments - consolidated investment companies | 64,526 | 22,798
Debt Securities |  |
Schedule of Investments [Line Items] |  |
Investments - consolidated investment companies | 38,900 | 20,900
Stocks of large U.S. and international companies |  |
Schedule of Investments [Line Items] |  |
Investments - consolidated investment companies | 22,600 | 1,600
Federated Funds |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | 20,100 | 4,100
Separate Accounts |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | 6,800 | 6,800
Separate Accounts | Debt Securities |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | 2,600 | 3,500
Separate Accounts | Equity |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | $ 3,000 | $ 2,700

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