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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
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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