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Consolidated Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fixed maturity securities:    
Available for sale, at fair value, amortized cost $ 31,443,319us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis $ 30,205,046us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Held for investment, at amortized cost, fair value 82,984us-gaap_HeldToMaturitySecuritiesFairValue 75,838us-gaap_HeldToMaturitySecuritiesFairValue
Equity securities, available for sale, at fair value, cost $ 7,511us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis $ 7,509us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Stockholders' equity:    
Preferred stock, par value (dollars per share) $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 2,000,000us-gaap_PreferredStockSharesAuthorized 2,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value (dollars per share) $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 76,681,287us-gaap_CommonStockSharesIssued 76,062,407us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 76,681,287us-gaap_CommonStockSharesOutstanding 76,062,407us-gaap_CommonStockSharesOutstanding
Common stock, shares held in treasury 3,685,784us-gaap_TreasuryStockShares 4,126,167us-gaap_TreasuryStockShares