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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 | Sep. 30, 2019 | Dec. 31, 2018
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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 | $ 1,332,893 | $ 4,265,915
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (23,779) | (120,838)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 2,484,503 | 5,548,934
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (111,399) | (247,060)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 3,817,396 | 9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (135,178) | (367,898)
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 | 23,964 | 76,226
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (20) | (158)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 316,601 | 777,409
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (1,804) | (14,943)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 340,565 | 853,635
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (1,824) | (15,101)
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 | 6,672 | 71,559
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (52) | (1,444)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 3,518 | 38,105
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (46) | (1,395)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 10,190 | 109,664
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (98) | (2,839)
Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 524,855 | 2,513,463
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (11,045) | (69,619)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 526,975 | 1,683,729
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (27,880) | (71,896)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,051,830 | 4,197,192
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (38,925) | (141,515)
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 | 337,232 | 230,285
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (2,029) | (2,746)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 175,138 | 245,300
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (689) | (2,746)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 512,370 | 475,585
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (2,718) | (5,492)
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 | 4,944 | 71,167
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation |  | (1,128)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 47,201 | 154,201
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (699) | (4,212)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 52,145 | 225,368
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (699) | (5,340)
Agency Residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 32,779 | 156,930
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (95) | (975)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 617,460 | 1,373,629
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (6,881) | (42,846)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 650,239 | 1,530,559
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (6,976) | (43,821)
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 | 3,200 | 10,174
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (16) | (26)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 2,381 |
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 | 5,581 | 10,174
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (18) | (26)
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 | 163,595 | 196,303
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (4,794) | (9,719)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 304,079 | 494,156
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (31,215) | (46,187)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 467,674 | 690,459
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (36,009) | (55,906)
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 | 235,652 | 939,808
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (5,728) | (35,023)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 491,150 | 782,405
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (42,183) | (62,835)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 726,802 | 1,722,213
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | $ (47,911) | $ (97,858)

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