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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 | Jun. 30, 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 | $ 4,997,468 | $ 2,017,481
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (147,673) | (67,958)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 117,681 | 660,968
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (6,856) | (56,854)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 5,115,149 | 2,678,449
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (154,529) | (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 | 341,846 | 135,190
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (12,494) | (7,134)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 2,620 |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (262) |
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 344,466 | 135,190
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (12,756) | (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 | 23,662 | 19,524
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (986) | (999)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value |  | 4,059
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation |  | (255)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 23,662 | 23,583
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (986) | (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 | 1,598,159 | 669,755
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (61,141) | (26,159)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 37,936 | 247,962
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (1,877) | (29,072)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,636,095 | 917,717
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (63,018) | (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 | 710,904 | 235,566
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (2,955) | (4,768)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value |  | 85,595
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation |  | (930)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 710,904 | 321,161
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (2,955) | (5,698)
Mortgage-Backed Securities: Commercial [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 134,941 | 53,511
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (3,535) | (578)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value |  | 6,592
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation |  | (317)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 134,941 | 60,103
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (3,535) | (895)
Mortgage Backed Securities: Agency residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 1,020,232 | 434,447
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (11,327) | (2,016)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 43,983 | 50,353
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (878) | (1,047)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,064,215 | 484,800
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (12,205) | (3,063)
Mortgage Backed Securities: 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 | 1,309 | 185
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (15) | (2)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value |  |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation |  |
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,309 | 185
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (15) | (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 | 304,722 | 114,755
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (20,686) | (8,813)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 3,107 | 150,812
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (610) | (13,637)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 307,829 | 265,567
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (21,296) | (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 | 861,693 | 354,548
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (34,534) | (17,489)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 30,035 | 115,595
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (3,229) | (11,596)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 891,728 | 470,143
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | $ (37,763) | $ (29,085)

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