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Investments - Narrative (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Investments [Line Items] |  |
Investments—affiliates and other | $ 12,033 | $ 10,860
Investments - Consolidated Investment Companies | 15,593 | 22,798
Domestic Debt Securities |  |
Schedule of Investments [Line Items] |  |
Investments - Consolidated Investment Companies | 13,900 | 20,900
Separate Accounts |  |
Schedule of Investments [Line Items] |  |
Investments—affiliates and other | 7,200 | 6,800
Separate Accounts | Domestic Debt Securities |  |
Schedule of Investments [Line Items] |  |
Investments—affiliates and other | 3,500 | 3,500
Separate Accounts | Equity |  |
Schedule of Investments [Line Items] |  |
Investments—affiliates and other | 3,000 | 2,700
Federated Funds |  |
Schedule of Investments [Line Items] |  |
Investments—affiliates and other | $ 4,800 | $ 4,100

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