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Fair Value Measurements - Ltd Partnerships (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other long-term investments | $ 85,738 | $ 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 | 0 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 | $ 34,813 | $ 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 | $ 0 | $ 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 | $ 0 | $ 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 | $ 35,787 | $ 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 | $ 2,154 | $ 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 | $ 13,817 | $ 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 | $ 3,925 | $ 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 | 84,417 | 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 | $ 6,079 | $ 15,431

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