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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total net realized capital gains (losses) | $ 104,109 | $ 184,648 | $ 143,011 | $ (25,940)
Beginning Balance | (8,723) | (21,774) | (1,745) |
Credit losses on securities where credit losses were not previously recorded | (14,592) | (10,960) | (21,890) | (32,734)
Increases in allowance on previously impaired securities | (1,468) | (1,082) | (1,468) | (1,082)
Decrease in allowance on previously impaired securities |  | 4,336 |  | 4,336
Reduction in allowance due to disposals | 133 | 3,643 | 453 | 3,643
Ending Balance | (24,650) | (25,837) | (24,650) | (25,837)
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance |  |  | (1,745) |
Ending Balance | (24,650) |  | (24,650) |
Fixed Maturity Securities [Member] | Market Value [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Allowance for credit losses | (15,927) | (4,063) | (22,904) | (25,837)
Gains (losses) from sales | 10,060 | 9,619 | 19,234 | (4,457)
Fixed Maturity Securities [Member] | Fair Value [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gains (losses) from sales |  |  |  |
Gains (losses) from fair value adjustments |  | (272) |  | (1,395)
Corporate Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance | (3,603) | (17,305) | (1,220) |
Credit losses on securities where credit losses were not previously recorded | (13,537) | (10,355) | (15,920) | (27,660)
Increases in allowance on previously impaired securities | (1,468) | (782) | (1,468) | (782)
Decrease in allowance on previously impaired securities |  | 3,431 |  | 3,431
Reduction in allowance due to disposals | 133 | 2,758 | 133 | 2,758
Ending Balance | (18,475) | (22,253) | (18,475) | (22,253)
Equity Securities [Member] | Fair Value [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gains (losses) from sales | 3,755 | 16,274 | 9,993 | (11,325)
Gains (losses) from fair value adjustments | 103,525 | 161,694 | 132,581 | 17,691
Other Invested Assets [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gains (losses) from sales | 2,748 | 1,293 | 4,094 | (1,034)
Short-Term Investments [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gains (losses) from sales | (52) | 103 | 13 | 417
Asset Backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance | (4,915) |  |  |
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 |  |  |  |
Ending Balance | (4,915) |  | (4,915) |
Foreign Government Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance |  | (519) | (22) |
Credit losses on securities where credit losses were not previously recorded |  |  |  | (519)
Increases in allowance on previously impaired securities |  |  |  |
Decrease in allowance on previously impaired securities |  | 212 |  | 212
Reduction in allowance due to disposals |  | 215 | 22 | 215
Ending Balance |  | (92) |  | (92)
Foreign Corporate Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance | (205) | (3,950) | (503) |
Credit losses on securities where credit losses were not previously recorded | (1,055) | (605) | (1,055) | (4,555)
Increases in allowance on previously impaired securities |  | (300) |  | (300)
Decrease in allowance on previously impaired securities |  | 693 |  | 693
Reduction in allowance due to disposals |  | 670 | 298 | 670
Ending Balance | $ (1,260) | $ (3,492) | $ (1,260) | $ (3,492)

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