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Investments - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Investments—affiliates and other $ 8,379 $ 7,863
Consolidated Investment Companies 31,737 45,411
Domestic Debt Securities    
Schedule of Investments [Line Items]    
Investments—affiliates and other 3,000 3,000
Consolidated Investment Companies 29,600 39,200
Equity    
Schedule of Investments [Line Items]    
Investments—affiliates and other 2,700 2,600
Equity Securities - Small and Mid-Cap    
Schedule of Investments [Line Items]    
Consolidated Investment Companies   3,800
Separate Accounts    
Schedule of Investments [Line Items]    
Investments—affiliates and other 6,400 6,300
Federated Funds    
Schedule of Investments [Line Items]    
Investments—affiliates and other $ 2,000 $ 1,600