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Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Other-than-temporary impairments |  | $ (5,157,000) |  | $ 8,090,000
Total net realized capital gains (losses) | 184,648,000 | 30,272,000 | (25,940,000) | 122,504,000
Beginning Balance | (21,774,000) |  | 0 |
Credit losses on securities where credit losses were not previously recorded | (10,960,000) |  | (32,734,000) |
Increases in allowance on previously impaired securities | (1,082,000) |  | (1,082,000) |
Decrease in allowance on previously impaired securities | 4,336,000 |  | 4,336,000 |
Reduction in allowance due to disposals | 3,643,000 |  | 3,643,000 |
Balance as of June 30, 2020 | (25,837,000) |  | (25,837,000) |
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Balance as of June 30, 2020 | (25,837,000) |  | (25,837,000) |
Fixed Maturity Securities [Member] | Market Value [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Allowance for credit losses | (4,063,000) |  | 25,837,000 |
Other-than-temporary impairments |  | (5,157,000) |  | (8,090,000)
Gains (losses) from sales | 9,619,000 | 6,097,000 | (4,457,000) | 11,370,000
Fixed Maturity Securities [Member] | Fair Value [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gains (losses) from sales |  | 356,000 |  | 356,000
Gains (losses) from fair value adjustments | (272,000) |  | (1,395,000) | 13,000
Corporate Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance | (17,305,000) |  |  |
Credit losses on securities where credit losses were not previously recorded | (10,355,000) |  | (27,660,000) |
Increases in allowance on previously impaired securities | (782,000) |  | (782,000) |
Decrease in allowance on previously impaired securities | 3,431,000 |  | 3,431,000 |
Reduction in allowance due to disposals | 2,758,000 |  | 2,758,000 |
Balance as of June 30, 2020 | (22,253,000) |  | (22,253,000) |
Equity Securities [Member] | Fair Value [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gains (losses) from sales | 16,274,000 | (1,315,000) | (11,325,000) | 3,733,000
Gains (losses) from fair value adjustments | 161,694,000 | 30,362,000 | 17,691,000 | 114,803,000
Other Invested Assets [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gains (losses) from sales | 1,293,000 | (153,000) | (1,034,000) | 243,000
Short-Term Investments [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gains (losses) from sales | 103,000 | $ 82,000 | 417,000 | $ 76,000
Foreign Government Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance | (519,000) |  |  |
Credit losses on securities where credit losses were not previously recorded |  |  | (519,000) |
Increases in allowance on previously impaired securities |  |  |  |
Decrease in allowance on previously impaired securities | 212,000 |  | 212,000 |
Reduction in allowance due to disposals | 215,000 |  | 215,000 |
Balance as of June 30, 2020 | (92,000) |  | (92,000) |
Foreign Corporate Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Beginning Balance | (3,950,000) |  |  |
Credit losses on securities where credit losses were not previously recorded | (605,000) |  | (4,555,000) |
Increases in allowance on previously impaired securities | (300,000) |  | (300,000) |
Decrease in allowance on previously impaired securities | 693,000 |  | 693,000 |
Reduction in allowance due to disposals | 670,000 |  | 670,000 |
Balance as of June 30, 2020 | $ (3,492,000) |  | $ (3,492,000) |

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