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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, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	$ 16,493,187	$ 16,473,491
Fixed maturity securities - available for sale, Market Value	16,545,895	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	1,344,371	1,456,960
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost	6,615,039	6,757,107
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost	3,689,664	3,471,370
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost	885,625	902,289
Fixed maturity securities - available for sale, Due in one year or less, Market Value	1,344,301	1,457,919
Fixed maturity securities - available for sale, Due after one year through five years, Market Value	6,631,502	6,869,359
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value	3,742,527	3,609,816
Fixed maturity securities - available for sale, Due after ten years, Market Value	858,145	941,676
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	981,323	892,373
Fixed maturity securities - available for sale, Market Value	904,153	897,333
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	816,098	814,570
Fixed maturity securities - available for sale, Market Value	840,099	844,557
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	2,156,914	2,173,099
Fixed maturity securities - available for sale, Market Value	2,221,171	2,198,581
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	4,153	5,723
Fixed maturity securities - available for sale, Market Value	$ 3,997	$ 5,703

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