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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, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | $ (21,807) | $ (120,838)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (123,085) | (247,060)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 4,600,542 | 9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (144,892) | (367,898)
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 | 939,439 | 4,265,915
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (21,807) | (120,838)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 3,661,103 | 5,548,934
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (123,085) | (247,060)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 4,600,542 | 9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (144,892) | (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 | 37,959 | 76,226
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (11) | (158)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 352,523 | 777,409
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (2,567) | (14,943)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 390,482 | 853,635
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (2,578) | (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 | 2,994 | 71,559
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (50) | (1,444)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 9,840 | 38,105
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (301) | (1,395)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 12,834 | 109,664
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (351) | (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 | 243,339 | 2,513,463
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (9,044) | (69,619)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 956,838 | 1,683,729
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (24,338) | (71,896)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,200,177 | 4,197,192
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (33,382) | (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 | 313,948 | 230,285
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (1,051) | (2,746)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 206,558 | 245,300
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (907) | (2,746)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 520,506 | 475,585
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (1,958) | (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 | 3,168 | 71,167
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (35) | (1,128)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 75,713 | 154,201
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (892) | (4,212)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 78,881 | 225,368
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (927) | (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 | 38,520 | 156,930
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (100) | (975)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 1,068,294 | 1,373,629
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (11,611) | (42,846)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,106,814 | 1,530,559
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (11,711) | (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 | 6,902 | 10,174
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (15) | (26)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 0 |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | 0 |
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 6,902 | 10,174
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (15) | (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 | 133,946 | 196,303
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (6,114) | (9,719)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 355,728 | 494,156
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (33,434) | (46,187)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 489,674 | 690,459
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (39,548) | (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 | 158,663 | 939,808
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (5,387) | (35,023)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 635,609 | 782,405
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (49,035) | (62,835)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 794,272 | 1,722,213
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | $ (54,422) | $ (97,858)

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