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Investments (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of realized investment gains (losses)      
Realized investment gains $ 27,298 $ 37,663 $ 23,769
Fixed maturities [Member]
     
Summary of realized investment gains (losses)      
Realized investment gains 23,218 37,466 21,796
Equity Securities [Member]
     
Summary of realized investment gains (losses)      
Realized investment gains 4,080 197 (220)
Short-term and other investments [Member]
     
Summary of realized investment gains (losses)      
Realized investment gains     $ 2,193