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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, 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 | $ 1,966,968 | $ 1,730,364
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (68,531) | (26,793)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 831,126 | 1,909,627
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (100,856) | (94,376)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 2,798,094 | 3,639,991
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (169,387) | (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 | 74,911 | 67,879
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (897) | (1,237)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 154,772 | 416,583
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (24,782) | (23,004)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 229,683 | 484,462
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (25,679) | (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 | 738,690 | 464,753
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (23,176) | (7,960)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 325,533 | 689,195
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (32,475) | (38,138)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,064,223 | 1,153,948
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (55,651) | (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 | 368,721 | 495,741
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (16,989) | (12,388)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 51,998 | 103,612
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (8,556) | (11,100)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 420,719 | 599,353
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (25,545) | (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 | 142,927 | 98,043
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (8,699) | (1,658)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 61,211 | 90,328
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (26,073) | (11,678)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 204,138 | 188,371
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (34,772) | (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 | 457,430 | 176,222
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (16,504) | (1,027)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 138,272 | 94,190
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (7,314) | (831)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 595,702 | 270,412
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (23,818) | (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 | 184,289 | 427,726
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (2,266) | (2,523)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 99,340 | 515,719
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (1,656) | (9,625)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 283,629 | 943,445
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | $ (3,922) | $ (12,148)

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