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Fair Value Measurements - Classes of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Financial Assets    
Cash and Cash Equivalents $ 342,757 $ 336,782
Other 11,765 7,007
Total Financial Assets 532,573 528,761
Financial Liabilities    
Total Financial Liabilities 8,191 8,470
Consolidated Investment Companies    
Financial Assets    
Investments 108,426 108,448
Affiliates    
Financial Assets    
Investments 69,625 76,524
Level 1    
Financial Assets    
Cash and Cash Equivalents 342,757 336,782
Other 6,779 6,538
Total Financial Assets 443,706 463,808
Financial Liabilities    
Total Financial Liabilities 0 27
Level 1 | Consolidated Investment Companies    
Financial Assets    
Investments 26,909 49,119
Level 1 | Affiliates    
Financial Assets    
Investments 67,261 71,369
Level 2    
Financial Assets    
Cash and Cash Equivalents 0 0
Other 4,986 469
Total Financial Assets 88,842 64,928
Financial Liabilities    
Total Financial Liabilities 0 4
Level 2 | Consolidated Investment Companies    
Financial Assets    
Investments 81,517 59,329
Level 2 | Affiliates    
Financial Assets    
Investments 2,339 5,130
Level 3    
Financial Assets    
Cash and Cash Equivalents 0 0
Other 0 0
Total Financial Assets 25 25
Financial Liabilities    
Total Financial Liabilities 8,191 8,439
Level 3 | Consolidated Investment Companies    
Financial Assets    
Investments 0 0
Level 3 | Affiliates    
Financial Assets    
Investments $ 25 $ 25