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Investments - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Investments—affiliates and other $ 12,033 $ 10,860
Investments - Consolidated Investment Companies 15,593 22,798
Domestic Debt Securities    
Schedule of Investments [Line Items]    
Investments - Consolidated Investment Companies 13,900 20,900
Separate Accounts    
Schedule of Investments [Line Items]    
Investments—affiliates and other 7,200 6,800
Separate Accounts | Domestic Debt Securities    
Schedule of Investments [Line Items]    
Investments—affiliates and other 3,500 3,500
Separate Accounts | Equity    
Schedule of Investments [Line Items]    
Investments—affiliates and other 3,000 2,700
Federated Funds    
Schedule of Investments [Line Items]    
Investments—affiliates and other $ 4,800 $ 4,100