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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 | Mar. 31, 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 | $ (28,026) | $ (120,838)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 7,719,536 | 9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (195,377) | (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 | 1,282,933 | 4,265,915
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (28,026) | (120,838)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 6,436,603 | 5,548,934
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (167,351) | (247,060)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 7,719,536 | 9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (195,377) | (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 | (7) | (158)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 744,365 | 777,409
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (9,725) | (14,943)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 782,324 | 853,635
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (9,732) | (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 | 11,115 | 71,559
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (296) | (1,444)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 34,646 | 38,105
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (557) | (1,395)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 45,761 | 109,664
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (853) | (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 | 662,132 | 2,513,463
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (15,967) | (69,619)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 2,433,428 | 1,683,729
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (41,355) | (71,896)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 3,095,560 | 4,197,192
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (57,322) | (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 | 227,072 | 230,285
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (1,347) | (2,746)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 294,558 | 245,300
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (1,737) | (2,746)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 521,630 | 475,585
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (3,084) | (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 | 8,675 | 71,167
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (56) | (1,128)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 142,509 | 154,201
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (2,214) | (4,212)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 151,184 | 225,368
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (2,270) | (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 | 27,212 | 156,930
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (74) | (975)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 1,326,304 | 1,373,629
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (29,244) | (42,846)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,353,516 | 1,530,559
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (29,318) | (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 | 9,737 | 10,174
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (36) | (26)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value |  |
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 9,737 | 10,174
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (36) | (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 | 101,317 | 196,303
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (5,008) | (9,719)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 420,137 | 494,156
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (33,723) | (46,187)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 521,454 | 690,459
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (38,731) | (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 | 197,714 | 939,808
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (5,235) | (35,023)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 1,040,656 | 782,405
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (48,796) | (62,835)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,238,370 | 1,722,213
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | $ (54,031) | $ (97,858)

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