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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 | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | $ 8,094,261 | $ 2,017,481
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (127,800) | (67,958)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 1,240,691 | 660,968
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (75,330) | (56,854)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 9,334,952 | 2,678,449
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (203,130) | (124,812)
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 | 8,094,261 | 2,017,481
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (127,800) | (67,958)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 1,240,691 | 660,968
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (75,330) | (56,854)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 9,334,952 | 2,678,449
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (203,130) | (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 | 504,168 | 135,190
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (6,264) | (7,134)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 91,735 |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (4,094) |
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 595,903 | 135,190
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (10,358) | (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 | 51,094 | 19,524
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (1,038) | (999)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 2,558 | 4,059
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (112) | (255)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 53,652 | 23,583
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (1,150) | (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 | 2,132,576 | 669,755
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (38,316) | (26,159)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 472,831 | 247,962
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (24,264) | (29,072)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 2,605,407 | 917,717
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (62,580) | (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 | 1,954,079 | 235,566
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (11,180) | (4,768)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 41,823 | 85,595
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (668) | (930)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,995,902 | 321,161
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (11,848) | (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 | 221,852 | 53,511
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (2,854) | (578)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 40,496 | 6,592
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (2,836) | (317)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 262,348 | 60,103
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (5,690) | (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 | 1,101,215 | 434,447
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (12,178) | (2,016)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 279,697 | 50,353
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (6,695) | (1,047)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,380,912 | 484,800
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (18,873) | (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 | 2,320 | 185
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (14) | (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 | 2,476 | 185
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (16) | (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 | 392,447 | 114,755
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (9,709) | (8,813)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 100,673 | 150,812
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (18,370) | (13,637)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 493,120 | 265,567
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (28,079) | (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 | 1,734,510 | 354,548
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (46,247) | (17,489)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 210,722 | 115,595
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (18,289) | (11,596)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,945,232 | 470,143
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | $ (64,536) | $ (29,085)

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