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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, 2021 | Dec. 31, 2020
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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 | $ 4,997,468 | $ 2,017,481
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (147,673) | (67,958)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 117,681 | 660,968
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (6,856) | (56,854)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 5,115,149 | 2,678,449
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (154,529) | (124,812)
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 | 260,687 | 96,144
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (15,951) | (4,942)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 5,846 | 112,419
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (471) | (12,071)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 266,533 | 208,563
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (16,422) | (17,013)
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 | 1,385,520 | 653,816
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (51,928) | (32,469)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 48,824 | 283,866
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (3,048) | (21,319)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,434,344 | 937,682
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (54,976) | (53,788)
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 | 1,153,553 | 422,517
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (48,557) | (19,392)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 19,028 | 49,749
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (2,459) | (2,034)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,172,581 | 472,266
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (51,016) | (21,426)
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 | 330,322 | 121,295
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (13,405) | (3,791)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value |  | 72,394
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation |  | (19,136)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 330,322 | 193,689
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (13,405) | (22,927)
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 | 710,904 | 235,566
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (2,955) | (4,768)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value |  | 85,595
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation |  | (930)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 710,904 | 321,161
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (2,955) | (5,698)
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 | 1,156,482 | 488,143
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (14,877) | (2,596)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 43,983 | 56,945
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (878) | (1,364)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,200,465 | 545,088
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | $ (15,755) | $ (3,960)

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