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Fair Value Measurements - Ltd Partnerships (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investment related gains (losses), net | $ (892) | $ (4,991) | $ (477) | $ (10,589) |
Other long-term investments | 79,798 |  | $ 79,798 |  | $ 69,558
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 | 35,869 |  | $ 35,869 |  | $ 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 |  | $ 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 | 9,383 |  | $ 9,383 |  | $ 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 |  | 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 | 19,567 |  | $ 19,567 |  | $ 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 | 15,629 |  | $ 15,629 |  | $ 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 | 14,716 |  | $ 14,716 |  | $ 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 | 11,233 |  | $ 11,233 |  | 4,107
Limited Partnership Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investment related gains (losses), net | (100) | $ (4,200) | 200 | $ (9,400) |
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 | 79,535 |  | 79,535 |  | 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 | $ 30,314 |  | $ 30,314 |  | $ 28,562

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