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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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-Name Accounting Standards Codification
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