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Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | $ 15,440,999 | $ 15,406,572
Fixed maturity securities - available for sale, Market Value | 15,513,287 | 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 | 1,398,625 | 1,328,571
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost | 6,842,101 | 8,114,247
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost | 2,702,189 | 2,455,911
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost | 885,891 | 789,575
Fixed maturity securities - available for sale, Due in one year or less, Market Value | 1,406,138 | 1,330,534
Fixed maturity securities - available for sale, Due after one year through five years, Market Value | 6,838,316 | 8,016,490
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value | 2,743,530 | 2,413,846
Fixed maturity securities - available for sale, Due after ten years, Market Value | 919,586 | 791,113
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 719,151 | 545,427
Fixed maturity securities - available for sale, Market Value | 717,165 | 540,097
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 523,600 | 329,883
Fixed maturity securities - available for sale, Market Value | 531,508 | 326,710
Agency Residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 2,359,677 | 1,832,760
Fixed maturity securities - available for sale, Market Value | 2,347,278 | 1,796,264
Non-Agency Residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 9,765 | 10,198
Fixed maturity securities - available for sale, Market Value | $ 9,766 | $ 10,209

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