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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 | Dec. 31, 2020 | Dec. 31, 2019
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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 | $ 2,017,481 | $ 1,730,364
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (67,958) | (26,793)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 660,968 | 1,909,627
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (56,854) | (94,376)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 2,678,449 | 3,639,991
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (124,812) | (121,169)
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 | 96,144 | 67,879
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (4,942) | (1,237)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 112,419 | 416,583
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (12,071) | (23,004)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 208,563 | 484,462
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (17,013) | (24,241)
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 | 653,816 | 464,753
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (32,469) | (7,960)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 283,866 | 689,195
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (21,319) | (38,138)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 937,682 | 1,153,948
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (53,788) | (46,098)
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 | 422,517 | 495,741
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (19,392) | (12,388)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 49,749 | 103,612
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (2,034) | (11,100)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 472,266 | 599,353
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (21,426) | (23,488)
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 | 121,295 | 98,043
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (3,791) | (1,658)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 72,394 | 90,328
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (19,136) | (11,678)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 193,689 | 188,371
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (22,927) | (13,336)
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 | 235,566 | 176,222
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (4,768) | (1,027)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 85,595 | 94,190
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (930) | (831)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 321,161 | 270,412
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (5,698) | (1,858)
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 | 488,143 | 427,726
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (2,596) | (2,523)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 56,945 | 515,719
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (1,364) | (9,625)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 545,088 | 943,445
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | $ (3,960) | $ (12,148)

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