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Fair Value of Financial Instruments (Levels) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investments in securities:      
Investments in trading securities $ 32,674 $ 15,342  
Total assets measured at fair value 32,915 18,369  
Asset Acquisition, Consideration Transferred, Contingent Consideration $ 10,100 12,900  
Unobservable input - revenue retention discount rate - minimum 11.50%    
Unobservable input - revenue retention discount rate - maximum 12.00%    
Unobservable input - revenue retention volatility - maximum 16.30%    
Unobservable input - revenue retention volatility - minimum 8.30%    
Unobservable input - revenue retention discount rate - weighted average 11.75%    
Unobservable input - revenue retention volatility - weighted average 11.30%    
Unobservable input - growth discount rate - weighted average 13.00%    
Unobservable input - growth discount rate - maximum 13.30%    
Unobservable input - growth discount rate - minimum 12.80%    
Unobservable input - growth volatility - weighted average 19.90%    
Unobservable input - growth volatility - maximum 24.90%    
Unobservable input - growth volatility - minimum 14.90%    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value $ 10,133 12,901 $ 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 0 12,901  
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings (2,768) 0  
Asset Acquisition, Contingent Consideration, Liability 10,133 12,901  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases (2,792) 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) 0 (1,577)  
Private Equity Investments [Member]      
Investments in securities:      
Equity Securities, FV-NI   2,792  
Private equity      
Investments in securities:      
Equity Securities, FV-NI 241 235  
Contingent Consideration Type [Domain]      
Investments in securities:      
Asset Acquisition, Consideration Transferred, Contingent Consideration 10,133 12,901  
Other Liabilities, Fair Value Disclosure 10,133 12,901  
Level 1      
Investments in securities:      
Investments in trading securities 32,674 15,342  
Total assets measured at fair value 32,674 15,342  
Level 1 | Private Equity Investments [Member]      
Investments in securities:      
Equity Securities, FV-NI   0  
Level 1 | Private equity      
Investments in securities:      
Equity Securities, FV-NI 0 0  
Level 2      
Investments in securities:      
Investments in trading securities 0 0  
Total assets measured at fair value 0 0  
Level 2 | Private Equity Investments [Member]      
Investments in securities:      
Equity Securities, FV-NI   0  
Level 2 | Private equity      
Investments in securities:      
Equity Securities, FV-NI 0 0  
Level 3      
Investments in securities:      
Investments in trading securities 0 0  
Total assets measured at fair value 0 2,792  
Level 3 | Private Equity Investments [Member]      
Investments in securities:      
Equity Securities, FV-NI   2,792  
Level 3 | Private equity      
Investments in securities:      
Equity Securities, FV-NI 0 0  
Level 3 | Contingent Consideration Type [Domain]      
Investments in securities:      
Asset Acquisition, Consideration Transferred, Contingent Consideration 10,133 12,901  
Other Liabilities, Fair Value Disclosure 10,133    
Fair Value Measured at Net Asset Value Per Share | Private Equity Investments [Member]      
Investments in securities:      
Equity Securities, FV-NI   0  
Fair Value Measured at Net Asset Value Per Share | Private equity      
Investments in securities:      
Equity Securities, FV-NI 241 235  
Inputs, Net Asset Value [Member]      
Investments in securities:      
Investments in trading securities 0 0  
Total assets measured at fair value $ 241 $ 235