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Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type) (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)
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 230,960 | 135,190
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (9,326) | (7,134)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 14,778 |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (2,211) |
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 245,738 | 135,190
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (11,537) | (7,134)
Obligations Of U.S. States And Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 57,823 | 19,524
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (1,709) | (999)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 12,079 | 4,059
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (1,032) | (255)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 69,902 | 23,583
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (2,741) | (1,254)
Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 1,571,716 | 669,755
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (61,150) | (26,159)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 253,539 | 247,962
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (24,405) | (29,072)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,825,255 | 917,717
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (85,555) | (55,231)
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)
Commercial 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 | 152,882 | 53,511
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (5,290) | (578)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 5,600 | 6,592
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (962) | (317)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 158,482 | 60,103
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (6,252) | (895)
Agency residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 899,288 | 434,447
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (13,640) | (2,016)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 54,717 | 50,353
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (1,084) | (1,047)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 954,005 | 484,800
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (14,724) | (3,063)
Non-agency residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 6,266 | 185
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (10) | (2)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 156 |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (2) |
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 6,422 | 185
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (12) | (2)
Foreign Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 215,989 | 114,755
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (11,701) | (8,813)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 123,143 | 150,812
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (15,459) | (13,637)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 339,132 | 265,567
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (27,160) | (22,450)
Foreign Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 782,295 | 354,548
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (32,134) | (17,489)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 100,457 | 115,595
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (10,576) | (11,596)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 882,752 | 470,143
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | $ (42,710) | $ (29,085)

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