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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Investments:    
Available for sale, amortized cost $ 35,823,710 $ 30,205,046
Held for investment, fair value 65,377 75,838
Equity securities, available for sale, amortized cost $ 7,515 $ 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 81,354,079 76,062,407
Common stock, shares outstanding 81,354,079 76,062,407
Common stock, shares held in treasury 3,448,750 4,126,167