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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fixed maturity securities:    
Available for sale, at fair value, amortized cost $ 34,058,330 $ 30,205,046
Held for investment, at amortized cost, fair value 62,000 75,838
Equity securities, available for sale, at fair value, cost $ 7,514 $ 7,509
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 81,190,936 76,062,407
Common stock, shares outstanding 81,190,936 76,062,407
Common stock, shares held in treasury 3,536,875 4,126,167