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