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Fair Value Measurements - Ltd Partnerships (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other long-term investments $ 72,254   $ 69,558
Investment related gains (losses), net $ (288) $ (582)  
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 4 years   5 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 $ 33,643   $ 33,234
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 $ 3,452   $ 6,011
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 $ 9,329   $ 9,037
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
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 $ 18,315   $ 16,892
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 5 years   5 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 7 years   7 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 $ 17,172   $ 18,444
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     11 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 $ 10,703   $ 7,683
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 10 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 12 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 $ 14,926   4,107
Limited Partnership Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment related gains (losses), net (600) $ (800)  
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 71,990   66,846
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 $ 35,550   $ 28,562