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Consolidation - Assets Related to Consolidated Sponsored Investment Products, Unobservable Input Reconciliation (Details) - Consolidated Investment Products - Debt investments - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ 54,182 $ 40,422
Purchases 10,708 2,197
Sales (41,362) (1,843)
Amortization 98 31
Change in unrealized gains (losses), net 2,203 (1,245)
Realized gains (loss), net (301) 20
Transfers to Level 2 (85,551) (61,335)
Transfers from Level 2 63,180 75,935
Balance at end of period $ 3,157 $ 54,182