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Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Fixed Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | $ 4,221,626 | $ 2,017,481
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (136,941) | (67,958)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 589,088 | 660,968
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (56,512) | (56,854)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 4,810,714 | 2,678,449
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (193,453) | (124,812)
Due In One Year Or Less [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 159,736 | 96,144
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (6,665) | (4,942)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 108,331 | 112,419
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (10,340) | (12,071)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 268,067 | 208,563
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (17,005) | (17,013)
Due In One Year Through Five Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 1,117,370 | 653,816
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (33,855) | (32,469)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 246,205 | 283,866
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (20,081) | (21,319)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,363,575 | 937,682
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (53,936) | (53,788)
Due In Five Years Through Ten Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 1,231,926 | 422,517
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (60,905) | (19,392)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 60,821 | 49,749
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (7,511) | (2,034)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,292,747 | 472,266
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (68,416) | (21,426)
Due After Ten Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 349,751 | 121,295
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (14,595) | (3,791)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 88,639 | 72,394
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (15,751) | (19,136)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 438,390 | 193,689
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (30,346) | (22,927)
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 304,407 | 235,566
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (1,981) | (4,768)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 24,619 | 85,595
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (781) | (930)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 329,026 | 321,161
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (2,762) | (5,698)
Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 1,058,436 | 488,143
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (18,940) | (2,596)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 60,473 | 56,945
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (2,048) | (1,364)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,118,909 | 545,088
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | $ (20,988) | $ (3,960)

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