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Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items] |  |  |
Total net realized capital gains (losses) | $ 257,943 | $ 267,649 | $ 185,004
Beginning Balance | (1,745) |  |
Credit losses on securities where credit losses were not previously recorded | (28,679) | (32,884) |
Increases in allowance on previously impaired securities | (5,293) | (6,645) |
Decrease in allowance on previously impaired securities |  | 5,525 |
Reduction in allowance due to disposals | 5,979 | 32,259 |
Ending Balance | (29,738) | (1,745) |
Fixed Maturity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Ending Balance | (29,738) |  |
Fixed Maturity Securities [Member] | Market Value [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Allowance for credit losses | (27,992) | (1,745) |
Other-than-temporary Impairments |  |  | (20,899)
Gains (losses) from sales | 16,503 | (2,214) | 28,025
Fixed Maturity Securities [Member] | Fair Value [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gains (losses) from sales |  | (2,863) | 355
Gains (losses) from fair value adjustments |  | 1,944 | 1,808
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 | (21,177) | (27,666) |
Increases in allowance on previously impaired securities | (2,529) | (6,136) |
Decrease in allowance on previously impaired securities |  | 4,333 |
Reduction in allowance due to disposals | 5,659 | 28,249 |
Ending Balance | (19,267) | (1,220) |
Equity Securities [Member] | Fair Value [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gains (losses) from sales | 27,596 | (8,963) | 4,148
Gains (losses) from fair value adjustments | 235,686 | 278,461 | 165,200
Other Invested Assets [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gains (losses) from sales | 6,142 | 1,705 | 6,003
Short-Term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gains (losses) from sales | 8 | 1,324 | 364
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 | (2,764) |  |
Decrease in allowance on previously impaired securities |  |  |
Reduction in allowance due to disposals |  |  |
Ending Balance | (7,679) |  |
Obligations Of U.S. States And Political Subdivisions [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Beginning Balance |  |  |
Credit losses on securities where credit losses were not previously recorded | (151) |  |
Increases in allowance on previously impaired securities |  |  |
Decrease in allowance on previously impaired securities |  |  |
Reduction in allowance due to disposals |  |  |
Ending Balance | (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 |  | (518) |
Increases in allowance on previously impaired securities |  | (28) |
Decrease in allowance on previously impaired securities |  | 309 |
Reduction in allowance due to disposals | 22 | 215 |
Ending Balance |  | (22) |
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 | (2,436) | (4,700) |
Increases in allowance on previously impaired securities |  | (481) |
Decrease in allowance on previously impaired securities |  | 883 |
Reduction in allowance due to disposals | 298 | 3,795 |
Ending Balance | $ (2,641) | $ (503) |

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