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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fixed maturity securities:    
Available for sale, at fair value, amortized cost $ 36,696,786 $ 35,823,710
Held for investment, at amortized cost, fair value 67,672 65,377
Equity securities, available for sale, at fair value, cost $ 7,517 $ 7,515
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 82,155,327 81,354,079
Common stock, shares outstanding 82,155,327 81,354,079
Common stock, shares held in treasury 3,198,805 3,448,750