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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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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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