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Consolidated Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fixed maturity securities:    
Available for sale, at fair value, amortized cost $ 27,255,625 $ 26,527,730
Held for investment, at amortized cost, fair value 64,920 60,840
Equity securities, available for sale, at fair value, cost $ 7,505 $ 7,503
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 72,390,229 70,535,404
Common stock, shares outstanding 72,390,229 70,535,404
Common stock, shares held in treasury 4,527,167 4,876,735
Unallocated common stock, shares held by ESOP 58,618 58,618