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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

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