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Parent Corporation Balance Sheets (Parenthetical) (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fixed income securities, available-for-sale, amortized cost $ 4,352,514 $ 3,975,786  
Preferred stock, par value per share $ 0 $ 0 $ 0
Preferred stock, shares authorized 5,000,000 5,000,000 5,000,000
Preferred stock, shares issued 0 0 0
Preferred stock, shares outstanding 0 0  
Common stock, par value per share $ 2 $ 2  
Common stock, shares authorized 360,000,000 360,000,000  
Common stock, shares issued 100,861,372 99,947,933  
Treasury stock, shares 43,500,642 43,353,181  
Parent Company [Member]      
Fixed income securities, available-for-sale, amortized cost $ 61,794 $ 49,890  
Preferred stock, par value per share $ 0 $ 0  
Preferred stock, shares authorized 5,000,000 5,000,000  
Preferred stock, shares issued 0 0  
Preferred stock, shares outstanding 0 0  
Common stock, par value per share $ 2 $ 2  
Common stock, shares authorized 360,000,000 360,000,000  
Common stock, shares issued 100,861,372 99,947,933  
Treasury stock, shares 43,500,642 43,353,181