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Fair Value Measurements Other Long-Term Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other Long-Term Investments | $ 69,558 | $ 57,399
Investment related gains (losses), net | (10,291) | 10,991
Private Equity Funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investment related gains (losses), net | $ (9,700) | $ 7,500
Middle market |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Range (In years) | 5 years | 10 years
Global equity market |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Range (In years) | 0 years | 0 years
Late-stage growth |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Range (In years) |  | 6 years
Late-stage growth | Maximum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Range (In years) | 7 years |
Late-stage growth | Minimum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Range (In years) | 5 years |
Infrastructure |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Range (In years) | 11 years | 12 years
Fair Value Measured at Net Asset Value Per Share | Private Equity Funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other Long-Term Investments | $ 66,846 | $ 56,038
Fair Value Measured at Net Asset Value Per Share | Private Equity Funds | Unfunded Loan Commitment |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other Long-Term Investments | 28,562 | 39,824
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 | 33,234 | 21,947
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 | 6,011 | 18,712
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 | 9,037 | 10,607
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 | 16,892 | 20,468
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 | 18,444 | 4,459
Fair Value Measured at Net Asset Value Per Share | Infrastructure |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other Long-Term Investments | 7,683 | 3,016
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 | $ 4,107 | $ 16,653

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