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Investments Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | $ 8,786 | $ 7,863
Investments—Consolidated Investment Companies | 33,603 | 45,411
Domestic Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | 2,900 | 3,000
Investments—Consolidated Investment Companies | 31,300 | 39,200
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | 2,500 | 2,600
Equity Securities - Small and Mid-Cap [Member] |  |
Schedule of Investments [Line Items] |  |
Investments—Consolidated Investment Companies |  | 3,800
Separate accounts [Member] |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | 6,200 | 6,300
Federated Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Investments—Affiliates and Other | $ 2,600 | $ 1,600

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