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Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other-than-temporary impairments |  |  |  |  |  |  |  |  |  | $ (20,899) | $ (8,110)
Total net realized capital gains (losses) | $ 183,386 | $ 110,203 | $ 184,648 | $ (210,588) | $ 75,443 | $ (12,943) | $ 30,272 | $ 92,232 | 267,649 | 185,004 | (127,136)
Beginning Balance |  |  |  |  |  |  |  |  |  |  |
Credit losses on securities where credit losses were not previously recorded |  |  |  |  |  |  |  |  | (32,884) |  |
Increases in allowance on previously impaired securities |  |  |  |  |  |  |  |  | (6,645) |  |
Decrease in allowance on previously impaired securities |  |  |  |  |  |  |  |  | 5,525 |  |
Reduction in allowance due to disposals |  |  |  |  |  |  |  |  | 32,259 |  |
Ending Balance | (1,745) |  |  |  |  |  |  |  | (1,745) |  |
Fixed Maturity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ending Balance | (1,745) |  |  |  |  |  |  |  | (1,745) |  |
Fixed Maturity Securities [Member] | Market Value [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  |  |  |  |  |  |  |  | (1,745) |  |
Other-than-temporary impairments |  |  |  |  |  |  |  |  |  | (20,899) | (8,110)
Gains (losses) from sales |  |  |  |  |  |  |  |  | (2,214) | 28,025 | (21,719)
Fixed Maturity Securities [Member] | Fair Value [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains (losses) from sales |  |  |  |  |  |  |  |  | (2,863) | 355 | (1,799)
Gains (losses) from fair value adjustments |  |  |  |  |  |  |  |  | 1,944 | 1,808 | 1,506
Corporate Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  |  |  |  |  |  |
Credit losses on securities where credit losses were not previously recorded |  |  |  |  |  |  |  |  | (27,666) |  |
Increases in allowance on previously impaired securities |  |  |  |  |  |  |  |  | (6,136) |  |
Decrease in allowance on previously impaired securities |  |  |  |  |  |  |  |  | 4,333 |  |
Reduction in allowance due to disposals |  |  |  |  |  |  |  |  | 28,249 |  |
Ending Balance | (1,220) |  |  |  |  |  |  |  | (1,220) |  |
Equity Securities [Member] | Fair Value [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains (losses) from sales |  |  |  |  |  |  |  |  | (8,963) | 4,148 | (29,941)
Gains (losses) from fair value adjustments |  |  |  |  |  |  |  |  | 278,461 | 165,200 | (68,832)
Other Invested Assets [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains (losses) from sales |  |  |  |  |  |  |  |  | 1,705 | 6,003 | 1,815
Short-Term Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains (losses) from sales |  |  |  |  |  |  |  |  | 1,324 | 364 | $ (56)
Foreign Government Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  |  |  |  |  |  |
Credit losses on securities where credit losses were not previously recorded |  |  |  |  |  |  |  |  | (518) |  |
Increases in allowance on previously impaired securities |  |  |  |  |  |  |  |  | (28) |  |
Decrease in allowance on previously impaired securities |  |  |  |  |  |  |  |  | 309 |  |
Reduction in allowance due to disposals |  |  |  |  |  |  |  |  | 215 |  |
Ending Balance | (22) |  |  |  |  |  |  |  | (22) |  |
Foreign Corporate Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  |  |  |  |  |  |
Credit losses on securities where credit losses were not previously recorded |  |  |  |  |  |  |  |  | (4,700) |  |
Increases in allowance on previously impaired securities |  |  |  |  |  |  |  |  | (481) |  |
Decrease in allowance on previously impaired securities |  |  |  |  |  |  |  |  | 883 |  |
Reduction in allowance due to disposals |  |  |  |  |  |  |  |  | 3,795 |  |
Ending Balance | $ (503) |  |  |  |  |  |  |  | $ (503) |  |

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