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Consolidated Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fixed maturity securities:    
Available for sale, at fair value, amortized cost $ 25,783,116 $ 21,957,027
Held for investment, at amortized cost, fair value 60,843 61,521
Equity securities, available for sale, at fair value, cost $ 8,917 $ 44,598
Stockholders' equity:    
Preferred stock, par value (dollars per share) $ 1 $ 1
Preferred stock, shares authorized 2,000,000 2,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value (dollars per share) $ 1 $ 1
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 64,722,600 61,750,601
Common stock, shares outstanding 64,722,600 61,750,601
Common stock, shares held in treasury 4,876,735 5,127,379
Unallocated common stock, shares held by ESOP 186,485 239,799