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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, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities - available for sale, Amortized Cost $ 15,506,555 $ 15,406,572
Fixed maturity securities - available for sale, Market Value 15,804,524 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 1,566,736 1,328,571
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost 6,605,036 8,114,247
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost 2,761,724 2,455,911
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost 834,007 789,575
Fixed maturity securities - available for sale, Due in one year or less, Market Value 1,579,362 1,330,534
Fixed maturity securities - available for sale, Due after one year through five years, Market Value 6,687,305 8,016,490
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value 2,880,168 2,413,846
Fixed maturity securities - available for sale, Due after ten years, Market Value 875,017 791,113
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities - available for sale, Amortized Cost 759,213 545,427
Fixed maturity securities - available for sale, Market Value 759,601 540,097
Commercial Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities - available for sale, Amortized Cost 677,210 329,883
Fixed maturity securities - available for sale, Market Value 703,250 326,710
Agency Residential [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities - available for sale, Amortized Cost 2,294,248 1,832,760
Fixed maturity securities - available for sale, Market Value 2,311,416 1,796,264
Non-Agency Residential [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities - available for sale, Amortized Cost 8,381 10,198
Fixed maturity securities - available for sale, Market Value $ 8,405 $ 10,209