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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