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Fair Value Measurements Other Long-Term Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investment related gains (losses), net | $ 760 | $ (10,291) | $ 10,991
Other Long-Term Investments | 82,725 | 69,558 |
Limited Partnership Funds |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investment related gains (losses), net | $ 900 | $ (9,700) | $ 7,500
Middle market |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Range (In years) | 4 years | 5 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) | 4 years | 5 years |
Late-stage growth | Maximum [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Range (In years) | 6 years | 7 years |
Infrastructure |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Range (In years) | 10 years | 11 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 | $ 82,460 | $ 66,846 |
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 | 27,299 | 28,562 |
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 | 34,858 | 33,234 |
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 | 3,452 | 6,011 |
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 | 10,345 | 9,037 |
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 | 20,524 | 16,892 |
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 | 14,271 | 18,444 |
Fair Value Measured at Net Asset Value Per Share | Infrastructure |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other Long-Term Investments | 16,733 | 7,683 |
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 | $ 9,576 | $ 4,107 |

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