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Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Schedule of Available-for-sale Securities [Line Items] |  |
Total net realized capital gains (losses) | $ 38,902 | $ (210,588)
Beginning Balance | (1,745) |
Credit losses on securities where credit losses were not previously recorded | (7,298) | (21,774)
Increases in allowance on previously impaired securities |  |
Decrease in allowance on previously impaired securities |  |
Reduction in allowance due to disposals | 320 |
Ending Balance | (8,723) | (21,774)
Fixed Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Beginning Balance | (1,745) |
Ending Balance | (8,723) |
Fixed Maturity Securities [Member] | Market Value [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Allowance for credit losses | 6,977 | 21,774
Gains (losses) from sales | 9,174 | (14,076)
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 |  | (1,123)
Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Beginning Balance | (1,220) |
Credit losses on securities where credit losses were not previously recorded | (2,383) | (17,305)
Increases in allowance on previously impaired securities |  |
Decrease in allowance on previously impaired securities |  |
Reduction in allowance due to disposals |  |
Ending Balance | (3,603) | (17,305)
Equity Securities [Member] | Fair Value [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gains (losses) from sales | 6,238 | (27,599)
Gains (losses) from fair value adjustments | 29,056 | (144,003)
Other Invested Assets [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gains (losses) from sales | 1,346 | (2,327)
Short-Term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gains (losses) from sales | 66 | 314
Asset Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Beginning Balance |  |
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) |
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 |  | (519)
Increases in allowance on previously impaired securities |  |
Decrease in allowance on previously impaired securities |  |
Reduction in allowance due to disposals | 22 |
Ending Balance |  | (519)
Foreign Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Beginning Balance | (503) |
Credit losses on securities where credit losses were not previously recorded |  | (3,950)
Increases in allowance on previously impaired securities |  |
Decrease in allowance on previously impaired securities |  |
Reduction in allowance due to disposals | 298 |
Ending Balance | $ (205) | $ (3,950)

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