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Investments (AFS Fixed Maturity Securities by Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Investments [Abstract]    
Due in one year or less fair value $ 362,970  
Due after one year through five years fair value 1,904,084  
Due after five years through 10 years fair value 930,177  
Due after 10 years fair value 72,729  
Total AFS fixed maturity securities $ 3,269,960 $ 2,897,373