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Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities By Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Amortized Cost $ 11,731,173 $ 12,011,336
Fixed maturities - available for sale, at Market Value 12,293,524 12,450,469
Asset-Backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Amortized Cost 186,936 210,717
Fixed maturities - available for sale, at Market Value 193,406 218,301
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 494,098 572,985
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost 5,052,484 3,911,482
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost 2,188,080 2,564,948
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost 1,246,886 2,331,639
Fixed maturity securities - available for sale, Due in one year or less, Market Value 494,911 580,528
Fixed maturity securities - available for sale, Due after one year through five years, Market Value 5,268,748 4,057,230
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value 2,325,142 2,686,005
Fixed maturity securities - available for sale, Due after ten years, Market Value 1,354,208 2,402,163
Commercial Mortgage-Backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Amortized Cost 310,387 324,922
Fixed maturities - available for sale, at Market Value 321,427 337,219
Agency Residential Mortgage-Backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Amortized Cost 2,198,937 2,018,384
Fixed maturities - available for sale, at Market Value 2,282,593 2,093,282
Non-Agency Residential Mortgage-Backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, Amortized Cost 53,365 76,259
Fixed maturities - available for sale, at Market Value $ 53,089 $ 75,741