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Fair Value (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Market Value	$ 22,308,272	$ 20,040,173
Other invested assets	757,167	665,515
Asset Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Market Value	3,581,729	2,565,802
Internally Managed Public Equity Portfolio [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Market Value	1,300,000	784,400
Internally Managed Portfolio, Collateralized Loan Obligations [Member] | Asset Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Market Value	2,000,000
Market Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfer in and/or (out) of Level 3		(924)
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfer in and/or (out) of Level 3
Fair Value [Member] | Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other invested assets	286,600	224,700
Fixed Maturities [Member] | Market Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Market Value	$ 2,100,000	1,300,000
Fixed Maturities [Member] | Market Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfer in and/or (out) of Level 3		(900)
Equity Securities [Member] | Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfer in and/or (out) of Level 3		$ (9,900)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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