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Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity) (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)
Due In One Year Or Less [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 78,062 | 454,239
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (1,405) | (2,558)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 775,900 | 427,513
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (18,903) | (20,675)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 853,962 | 881,752
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (20,308) | (23,233)
Due In One Year Through Five Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 538,856 | 2,014,704
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (8,803) | (45,148)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 3,137,174 | 2,764,981
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (85,652) | (129,940)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 3,676,030 | 4,779,685
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (94,455) | (175,088)
Due In Five Years Through Ten Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 332,280 | 1,082,568
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (14,243) | (51,300)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 607,381 | 492,216
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (20,629) | (34,210)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 939,661 | 1,574,784
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (34,872) | (85,510)
Due After Ten Years [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 61,039 | 245,848
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (2,062) | (16,957)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 152,777 | 91,094
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (8,972) | (12,431)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 213,816 | 336,942
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (11,034) | (29,388)
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)
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 | 45,624 | 238,271
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (166) | (2,129)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 1,468,813 | 1,527,830
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (31,458) | (47,058)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,514,437 | 1,766,101
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | $ (31,624) | $ (49,187)

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