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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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