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 |