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Investments (Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items] |  |  |
Proceeds from sales of securities |  | $ 4,907 | $ 2,917
Proceeds from sales of equity securities | 990,376 | 376,347 | 283,965
Fixed Maturity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Proceeds from sales of securities | 1,915,916 | 1,950,774 | 3,283,154
Gross gains from sales | 71,744 | 79,609 | 63,721
Gross losses from sales | (55,241) | (84,686) | (35,341)
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Proceeds from sales of equity securities | 990,376 | 376,347 | 283,965
Gross gains from sales | 42,241 | 37,415 | 14,274
Gross losses from sales | $ (14,645) | $ (46,378) | $ (10,126)

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- Definition Amount of realized gain on 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 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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