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Fair Value Measurements - Ltd Partnerships (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other long-term investments $ 93,318 $ 93,604
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 2 years 3 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 $ 34,307 $ 35,369
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 $ 1,660 $ 1,660
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 $ 11,416 $ 11,568
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 $ 31,676 $ 27,825
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 3 years 3 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 5 years 5 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 $ 5,498 $ 8,134
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 $ 15,637 $ 18,575
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 8 years 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 10 years 10 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 $ 5,364 $ 5,637
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 93,036 93,337
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 $ 12,522 $ 15,431