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Fair Value Measurements - Ltd Partnerships (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investment related gains (losses), net $ (253) $ 703 $ 710 $ 415  
Other long-term investments 92,141   $ 92,141   $ 82,725
Limited Partnership Funds - Middle Market          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Estimated Maturity Timeframe of Other Long-Term Investments     3 years   4 years
Limited Partnership Funds - Middle Market | Fair Value Measured at Net Asset Value Per Share          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other long-term investments 36,816   $ 36,816   $ 34,858
Limited Partnership Funds - Middle Market | Unfunded Loan Commitment | Fair Value Measured at Net Asset Value Per Share          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other long-term investments 2,701   $ 2,701   $ 3,452
Limited Partnership Funds - Global          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Estimated Maturity Timeframe of Other Long-Term Investments     0 years   0 years
Limited Partnership Funds - Global | Fair Value Measured at Net Asset Value Per Share          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other long-term investments 10,909   $ 10,909   $ 10,345
Limited Partnership Funds - Global | Unfunded Loan Commitment | Fair Value Measured at Net Asset Value Per Share          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other long-term investments 0   0   0
Limited Partnership Funds - Late-Stage Growth | Fair Value Measured at Net Asset Value Per Share          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other long-term investments 24,973   $ 24,973   $ 20,524
Limited Partnership Funds - Late-Stage Growth | Minimum [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Estimated Maturity Timeframe of Other Long-Term Investments     4 years   4 years
Limited Partnership Funds - Late-Stage Growth | Maximum [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Estimated Maturity Timeframe of Other Long-Term Investments     6 years   6 years
Limited Partnership Funds - Late-Stage Growth | Unfunded Loan Commitment | Fair Value Measured at Net Asset Value Per Share          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other long-term investments 10,905   $ 10,905   $ 14,271
Limited Partnership Funds - Infrastructure          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Estimated Maturity Timeframe of Other Long-Term Investments         10 years
Limited Partnership Funds - Infrastructure | Fair Value Measured at Net Asset Value Per Share          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other long-term investments 19,177   $ 19,177   $ 16,733
Limited Partnership Funds - Infrastructure | Minimum [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Estimated Maturity Timeframe of Other Long-Term Investments     9 years    
Limited Partnership Funds - Infrastructure | Maximum [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Estimated Maturity Timeframe of Other Long-Term Investments     11 years    
Limited Partnership Funds - Infrastructure | Unfunded Loan Commitment | Fair Value Measured at Net Asset Value Per Share          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other long-term investments 7,548   $ 7,548   9,576
Limited Partnership Funds [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investment related gains (losses), net 4 $ 900 1,300 $ 300  
Limited Partnership Funds [Member] | Fair Value Measured at Net Asset Value Per Share          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other long-term investments 91,875   91,875   82,460
Limited Partnership Funds [Member] | Unfunded Loan Commitment | Fair Value Measured at Net Asset Value Per Share          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other long-term investments $ 21,154   $ 21,154   $ 27,299