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Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total net gains (losses) on investments | $ (236,265) | $ 104,109 | $ (389,892) | $ 143,011
Beginning Balance | (41,591) | (8,723) | (29,738) | (1,745)
Credit losses on securities where credit losses were not previously recorded | (9,593) | (14,592) | (22,706) | (21,890)
Increases in allowance on previously impaired securities | (1,386) | (1,468) | (1,386) | (1,468)
Decrease in allowance on previously impaired securities |  |  |  |
Reduction in allowance due to disposals | 9,856 | 133 | 11,116 | 453
Ending Balance | (42,714) | (24,650) | (42,714) | (24,650)
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance |  |  | (29,738) |
Ending Balance | (42,714) |  | (42,714) |
Fixed Maturity Securities [Member] | Market Value [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Allowance for credit losses | (1,490) | (15,927) | (13,343) | (22,904)
Gains (losses) from sales | (15,560) | 10,060 | (12,761) | 19,234
Corporate Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance | (20,049) | (3,603) | (19,267) | (1,220)
Credit losses on securities where credit losses were not previously recorded | (4,887) | (13,537) | (6,816) | (15,920)
Increases in allowance on previously impaired securities | (654) | (1,468) | (654) | (1,468)
Decrease in allowance on previously impaired securities |  |  |  |
Reduction in allowance due to disposals | 7 | 133 | 1,154 | 133
Ending Balance | (25,583) | (18,475) | (25,583) | (18,475)
Equity Securities [Member] | Fair Value [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gains (losses) from sales | (30,926) | 3,755 | (42,713) | 9,993
Gains (losses) from fair value adjustments | (188,924) | 103,525 | (325,784) | 132,581
Other Invested Assets [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gains (losses) from sales | 583 | 2,748 | 4,735 | 4,094
Short-Term Investments [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gains (losses) from sales | 52 | (52) | (26) | 13
Asset Backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance | (7,679) | (4,915) | (7,679) |
Credit losses on securities where credit losses were not previously recorded |  |  |  | (4,915)
Increases in allowance on previously impaired securities |  |  |  |
Decrease in allowance on previously impaired securities |  |  |  |
Reduction in allowance due to disposals | 7,679 |  | 7,679 |
Ending Balance |  | (4,915) |  | (4,915)
Obligations Of U.S. States And Political Subdivisions [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance | (151) |  | (151) |
Credit losses on securities where credit losses were not previously recorded |  |  |  |
Increases in allowance on previously impaired securities |  |  |  |
Decrease in allowance on previously impaired securities |  |  |  |
Reduction in allowance due to disposals |  |  |  |
Ending Balance | (151) |  | (151) |
Foreign Government Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance |  |  |  | (22)
Credit losses on securities where credit losses were not previously recorded |  |  |  |
Increases in allowance on previously impaired securities |  |  |  |
Decrease in allowance on previously impaired securities |  |  |  |
Reduction in allowance due to disposals |  |  |  | 22
Ending Balance |  |  |  |
Foreign Corporate Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance | (13,712) | (205) | (2,641) | (503)
Credit losses on securities where credit losses were not previously recorded | (4,706) | (1,055) | (15,890) | (1,055)
Increases in allowance on previously impaired securities | (732) |  | (732) |
Decrease in allowance on previously impaired securities |  |  |  |
Reduction in allowance due to disposals | 2,170 |  | 2,283 | 298
Ending Balance | $ (16,980) | $ (1,260) | $ (16,980) | $ (1,260)

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