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Balance Sheet Parentheticals Document (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fixed maturity securities:    
Available-for-sale Securities, Amortized Cost Basis $ 23,513,179 $ 21,957,027
Held for investment, at amortized cost, fair value 62,173 61,521
Equity securities, available for sale, at fair value, cost $ 44,172 $ 44,598
Stockholders' equity:    
Preferred stock par value (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 (per Share) $ 1 $ 1
Common stock shares authorized 200,000,000 200,000,000
Common stock shares issued 62,783,971 61,750,601
Common stock shares outstanding 62,783,971 61,750,601
Common stock share held in treasury 4,779,535 5,127,379
Unallocated common stock shares held by ESOP 239,799 239,799