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Fair Value Measurements - Ltd Partnerships (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other long-term investments | $ 77,262 |  | $ 77,262 |  | $ 69,558
Investment related gains (losses), net | 703 | $ (5,016) | $ 415 | $ (5,598) |
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 | 34,996 |  | $ 34,996 |  | $ 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 | 9,758 |  | $ 9,758 |  | $ 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 | 18,705 |  | $ 18,705 |  | $ 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 |  | $ 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 | 13,540 |  | $ 13,540 |  | $ 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 | 12,416 |  | $ 12,416 |  | 4,107
Limited Partnership Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investment related gains (losses), net | 900 | $ (4,400) | 300 | $ (5,200) |
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 | 76,999 |  | 76,999 |  | 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 | $ 33,040 |  | $ 33,040 |  | $ 28,562

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