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Investments - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Investments—Affiliates and Other	$ 26,935	$ 10,860
Investments - consolidated investment companies	64,526	22,798
Debt Securities
Schedule of Investments [Line Items]
Investments - consolidated investment companies	38,900	20,900
Stocks of large U.S. and international companies
Schedule of Investments [Line Items]
Investments - consolidated investment companies	22,600	1,600
Federated Funds
Schedule of Investments [Line Items]
Investments—Affiliates and Other	20,100	4,100
Separate Accounts
Schedule of Investments [Line Items]
Investments—Affiliates and Other	6,800	6,800
Separate Accounts | Debt Securities
Schedule of Investments [Line Items]
Investments—Affiliates and Other	2,600	3,500
Separate Accounts | Equity
Schedule of Investments [Line Items]
Investments—Affiliates and Other	$ 3,000	$ 2,700

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