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Fair Value Measurements Other Long-Term Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment related gains (losses), net | $ (2,626) | $ 760
Other Long-Term Investments | 93,604 | 82,725
Limited Partnership Funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment related gains (losses), net | $ (1,000) | $ 900
Middle market |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Range (In years) | 3 years | 4 years
Global equity market |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Range (In years) | 0 years | 0 years
Late-stage growth | Minimum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Range (In years) | 3 years | 4 years
Late-stage growth | Maximum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Range (In years) | 5 years | 6 years
Infrastructure |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Range (In years) | 9 years | 10 years
Fair Value Measured at Net Asset Value Per Share | Limited Partnership Funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other Long-Term Investments | $ 93,337 | $ 82,460
Fair Value Measured at Net Asset Value Per Share | Limited Partnership Funds | Unfunded Loan Commitment |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other Long-Term Investments | 15,431 | 27,299
Fair Value Measured at Net Asset Value Per Share | Middle market |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other Long-Term Investments | 35,369 | 34,858
Fair Value Measured at Net Asset Value Per Share | Middle market | Unfunded Loan Commitment |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other Long-Term Investments | 1,660 | 3,452
Fair Value Measured at Net Asset Value Per Share | Global equity market |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other Long-Term Investments | 11,568 | 10,345
Fair Value Measured at Net Asset Value Per Share | Global equity market | Unfunded Loan Commitment |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other Long-Term Investments | 0 | 0
Fair Value Measured at Net Asset Value Per Share | Late-stage growth |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other Long-Term Investments | 27,825 | 20,524
Fair Value Measured at Net Asset Value Per Share | Late-stage growth | Unfunded Loan Commitment |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other Long-Term Investments | 8,134 | 14,271
Fair Value Measured at Net Asset Value Per Share | Infrastructure |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other Long-Term Investments | 18,575 | 16,733
Fair Value Measured at Net Asset Value Per Share | Infrastructure | Unfunded Loan Commitment |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other Long-Term Investments | $ 5,637 | $ 9,576

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