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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fixed maturity securities:    
Available for sale, at fair value, amortized cost $ 40,717,733 $ 39,953,955
Held for investment, at amortized cost, fair value $ 70,795 $ 68,766
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 88,630,683 88,001,130
Common stock, shares outstanding 88,630,683 88,001,130
Common stock, shares held in treasury 2,647,149 2,887,082