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Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | $ 16,164,841 | $ 15,406,572
Fixed maturity securities - available for sale, Market Value | 16,566,133 | 15,225,263
Fixed Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Due in one year or less, Amortized Cost | 1,430,361 | 1,328,571
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost | 6,639,678 | 8,114,247
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost | 3,117,529 | 2,455,911
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost | 1,008,863 | 789,575
Fixed maturity securities - available for sale, Due in one year or less, Market Value | 1,444,393 | 1,330,534
Fixed maturity securities - available for sale, Due after one year through five years, Market Value | 6,750,145 | 8,016,490
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value | 3,274,937 | 2,413,846
Fixed maturity securities - available for sale, Due after ten years, Market Value | 1,054,797 | 791,113
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 864,311 | 545,427
Fixed maturity securities - available for sale, Market Value | 864,886 | 540,097
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 728,348 | 329,883
Fixed maturity securities - available for sale, Market Value | 767,292 | 326,710
Agency Residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 2,367,704 | 1,832,760
Fixed maturity securities - available for sale, Market Value | 2,401,616 | 1,796,264
Non-Agency Residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 8,047 | 10,198
Fixed maturity securities - available for sale, Market Value | $ 8,067 | $ 10,209

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