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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Investments:    
Available for sale, amortized cost $ 39,953,955 $ 35,823,710
Held for investment, fair value $ 68,766 $ 65,377
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 88,001,130 81,354,079
Common stock, shares outstanding 88,001,130 81,354,079
Common stock, shares held in treasury 2,887,082 3,448,750