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Investments (AFS Fixed Maturity Securities by Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Investments [Abstract]    
Due in one year or less fair value $ 348,176  
Due after one year through five years fair value 2,041,329  
Due after five years through 10 years fair value 1,046,526  
Due after 10 years fair value 29,950  
Total AFS fixed maturity securities $ 3,465,981 $ 3,296,013