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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, 2020 | Dec. 31, 2019
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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 | $ 2,017,481 | $ 1,730,364
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (67,958) | (26,793)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 660,968 | 1,909,627
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (56,854) | (94,376)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 2,678,449 | 3,639,991
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (124,812) | (121,169)
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 | 135,190 | 85,527
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (7,134) | (1,005)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value |  | 249,371
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation |  | (1,209)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 135,190 | 334,898
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (7,134) | (2,214)
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 | 19,524 | 4,600
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (999) | (38)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 4,059 | 5,522
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (255) | (51)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 23,583 | 10,122
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (1,254) | (89)
Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 669,755 | 547,120
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (26,159) | (9,877)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 247,962 | 395,369
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (29,072) | (27,890)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 917,717 | 942,489
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (55,231) | (37,767)
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 | 235,566 | 176,222
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (4,768) | (1,027)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 85,595 | 94,190
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (930) | (831)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 321,161 | 270,412
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (5,698) | (1,858)
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 | 53,511 | 83,127
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (578) | (689)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 6,592 | 23,063
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (317) | (560)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 60,103 | 106,190
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (895) | (1,249)
Agency Residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 434,447 | 344,267
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (2,016) | (1,834)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 50,353 | 488,680
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (1,047) | (9,045)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 484,800 | 832,947
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (3,063) | (10,879)
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 | 185 | 332
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (2) |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value |  | 3,976
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation |  | (20)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 185 | 4,308
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (2) | (20)
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 | 114,755 | 210,766
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (8,813) | (4,770)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 150,812 | 283,648
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (13,637) | (28,743)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 265,567 | 494,414
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (22,450) | (33,513)
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 | 354,548 | 278,403
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (17,489) | (7,553)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 115,595 | 365,808
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (11,596) | (26,027)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 470,143 | 644,211
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | $ (29,085) | $ (33,580)

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