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Investments - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Investments [Line Items] |  |
Investments—affiliates and other | $ 8,379 | $ 7,863
Consolidated Investment Companies | 31,737 | 45,411
Domestic Debt Securities |  |
Schedule of Investments [Line Items] |  |
Investments—affiliates and other | 3,000 | 3,000
Consolidated Investment Companies | 29,600 | 39,200
Equity |  |
Schedule of Investments [Line Items] |  |
Investments—affiliates and other | 2,700 | 2,600
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 | 6,400 | 6,300
Federated Funds |  |
Schedule of Investments [Line Items] |  |
Investments—affiliates and other | $ 2,000 | $ 1,600

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