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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt and equity securities $ 118,752 $ 117,301
Fixed-income securities owned 31,334 32,148
Assets, fair value 194,063 166,715
Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed-income securities owned 0 0
Assets, fair value 36,661 10,900
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed-income securities owned 31,334 32,148
Assets, fair value 150,086 149,449
Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt and equity securities 36,661 10,900
Equity securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt and equity securities 36,661 10,900
Equity securities | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt and equity securities 0 0
Available-for-sale debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt and equity securities 118,752 117,301
Available-for-sale debt securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt and equity securities 0 0
Available-for-sale debt securities | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt and equity securities 118,752 117,301
Investment Funds Sponsored by LSV    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment funds sponsored by LSV $ 7,316 $ 6,366