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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Investments [Abstract]    
Fixed maturities available for sale, Amortized Cost - Due in one year or less $ 64,222  
Fixed maturities available for sale, Amortized Cost - Due from one to five years 527,836  
Fixed maturities available for sale, Amortized Cost - Due from five to ten years 669,994  
Fixed maturities available for sale, Amortized Cost - Due from ten to twenty years 2,439,335  
Fixed maturities available for sale, Amortized Cost - Due after twenty years 7,114,402  
Mortgage-backed and asset-backed securities, Amortized Cost 108,455  
Total fixed maturities available for sale, Amortized Cost 10,924,244 10,435,497
Fixed maturities available for sale, Fair Value - Due in one year or less 64,895  
Fixed maturities available for sale, Fair Value - Due from one to five years 564,584  
Fixed maturities available for sale, Fair Value - Due from five to ten years 728,784  
Fixed maturities available for sale, Fair Value - Due from ten to twenty years 2,649,607  
Fixed maturities available for sale, Fair Value - Due after twenty years 7,799,590  
Mortgage-backed and asset-backed securities, Fair Value 80,745  
Total fixed maturities available for sale, Fair Value $ 11,888,205 $ 10,543,034