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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
CONSOLIDATED BALANCE SHEETS (Parenthetical)    
Fixed maturities, available for sale, amortized cost $ 10,821,338 $ 10,346,243
Equity securities, available for sale, cost $ 699,566 $ 327,207
Common shares, shares issued 170,159 154,912
Common shares, shares outstanding 125,588 112,393
Treasury shares, shares 44,571 42,519