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Fair Value (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities - available for sale	$ 21,880,443		$ 21,880,443		$ 22,308,272
Fair value of public equity portfolio	896,900,000		896,900,000		1,300,000
Other invested assets	857,550		857,550		757,167
Fixed maturities - held to maturity, at amortized cost, net of credit allowances (fair value: 2022, $71,245, credit allowances: 2022, $(366))	71,390		71,390
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value	71,245		71,245
Market Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories
Fair Value [Member] | Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other invested assets	297,200		297,200		286,600
Fixed Maturities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities - available for sale	2,200,000		2,200,000		2,100,000
Asset Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities - available for sale	3,898,679		3,898,679		3,581,729
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value	62,400		62,400
Asset Backed Securities [Member] | Internally Managed Portfolio, Collateralized Loan Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities - available for sale	$ 2,100,000		$ 2,100,000		$ 2,000,000

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