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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, 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 | $ 1,966,968 | $ 1,730,364
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (68,531) | (26,793)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 831,126 | 1,909,627
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (100,856) | (94,376)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 2,798,094 | 3,639,991
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (169,387) | (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 | 28,192 | 85,527
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (282) | (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 | 28,192 | 334,898
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (282) | (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 | 71,054 | 4,600
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (3,569) | (38)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 3,331 | 5,522
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (225) | (51)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 74,385 | 10,122
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (3,794) | (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 | 712,066 | 547,120
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (28,954) | (9,877)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 170,908 | 395,369
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (37,338) | (27,890)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 882,974 | 942,489
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (66,292) | (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 | 457,430 | 176,222
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (16,504) | (1,027)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 138,272 | 94,190
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (7,314) | (831)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 595,702 | 270,412
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (23,818) | (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 | 47,046 | 83,127
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (1,196) | (689)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 6,017 | 23,063
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (641) | (560)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 53,063 | 106,190
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (1,837) | (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 | 137,030 | 344,267
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (1,067) | (1,834)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 90,425 | 488,680
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (976) | (9,045)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 227,455 | 832,947
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (2,043) | (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 | 213 | 332
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (3) |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 2,898 | 3,976
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (39) | (20)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 3,111 | 4,308
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (42) | (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 | 112,183 | 210,766
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (6,363) | (4,770)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 201,603 | 283,648
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (27,574) | (28,743)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 313,786 | 494,414
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (33,937) | (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 | 401,754 | 278,403
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (10,593) | (7,553)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 217,672 | 365,808
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (26,749) | (26,027)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 619,426 | 644,211
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | $ (37,342) | $ (33,580)

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