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Investments - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Investments [Line Items] |  |
Consolidated Investment Companies | $ 10,860 | $ 7,863
Domestic and Foreign Debt Securities |  |
Schedule of Investments [Line Items] |  |
Consolidated Investment Companies | 20,900 | 39,200
Equity Securities - Small and Mid-Cap |  |
Schedule of Investments [Line Items] |  |
Consolidated Investment Companies |  | 3,800
Separate Accounts |  |
Schedule of Investments [Line Items] |  |
Investments-affiliates and other | 6,800 | 6,300
Separate Accounts | Domestic and Foreign Debt Securities |  |
Schedule of Investments [Line Items] |  |
Investments-affiliates and other | 3,500 | 3,000
Separate Accounts | Equity |  |
Schedule of Investments [Line Items] |  |
Investments-affiliates and other | 2,700 | 2,600
Federated Funds |  |
Schedule of Investments [Line Items] |  |
Investments-affiliates and other | $ 4,100 | $ 1,600

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