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Investments - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Investments—Affiliates and Other $ 68,831 $ 10,860
Investments - Consolidated Investment Companies 43,661 22,798
Debt Securities    
Schedule of Investments [Line Items]    
Investments - Consolidated Investment Companies 32,200 20,900
Stocks of large U.S. and international companies    
Schedule of Investments [Line Items]    
Investments - Consolidated Investment Companies 8,900 1,600
Separate Accounts    
Schedule of Investments [Line Items]    
Investments—Affiliates and Other 7,400 6,800
Separate Accounts | Debt Securities    
Schedule of Investments [Line Items]    
Investments—Affiliates and Other 3,300 3,500
Separate Accounts | Equity    
Schedule of Investments [Line Items]    
Investments—Affiliates and Other 3,200 2,700
Mutual Funds, including Federated Funds    
Schedule of Investments [Line Items]    
Investments—Affiliates and Other $ 61,400 $ 4,100