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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 | 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)
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 | 72,925 | 454,239
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (1,270) | (2,558)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 653,276 | 427,513
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (21,829) | (20,675)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 726,201 | 881,752
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (23,099) | (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 | 251,725 | 2,014,704
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (4,989) | (45,148)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 1,317,255 | 2,764,981
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (64,110) | (129,940)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,568,980 | 4,779,685
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (69,099) | (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 | 223,082 | 1,082,568
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (12,638) | (51,300)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 216,841 | 492,216
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (12,797) | (34,210)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 439,923 | 1,574,784
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (25,435) | (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 | 29,169 | 245,848
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (1,709) | (16,957)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 123,166 | 91,094
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (10,939) | (12,431)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 152,335 | 336,942
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (12,648) | (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 | 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)
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 | 48,590 | 238,271
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (150) | (2,129)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 1,144,007 | 1,527,830
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (12,503) | (47,058)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,192,597 | 1,766,101
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | $ (12,653) | $ (49,187)

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