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Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | $ 16,392,238 | $ 16,473,491
Fixed maturity securities - available for sale, Market Value | 17,055,259 | 16,824,944
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 | 1,401,446 | 1,456,960
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost | 6,415,691 | 6,757,107
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost | 3,712,330 | 3,471,370
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost | 915,873 | 902,289
Fixed maturity securities - available for sale, Due in one year or less, Market Value | 1,413,299 | 1,457,919
Fixed maturity securities - available for sale, Due after one year through five years, Market Value | 6,636,170 | 6,869,359
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value | 3,987,207 | 3,609,816
Fixed maturity securities - available for sale, Due after ten years, Market Value | 936,867 | 941,676
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 1,076,648 | 892,373
Fixed maturity securities - available for sale, Market Value | 1,069,558 | 897,333
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 850,616 | 814,570
Fixed maturity securities - available for sale, Market Value | 919,796 | 844,557
Agency Residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 2,016,481 | 2,173,099
Fixed maturity securities - available for sale, Market Value | 2,089,251 | 2,198,581
Non-Agency Residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 3,153 | 5,723
Fixed maturity securities - available for sale, Market Value | $ 3,111 | $ 5,703

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