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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Fixed maturities, available-for-sale, amortized cost (in dollars) $ 17,002,708us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis $ 18,953,144us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Fixed maturities, held for trading, amortized cost (in dollars) 122,978us-gaap_TradingSecuritiesCost 331,081us-gaap_TradingSecuritiesCost
Mortgage loans on real estate, allowances (in dollars) 2,890us-gaap_AllowanceForLoanAndLeaseLossesRealEstate 2,890us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
Short-term investments, available-for-sale, amortized cost (in dollars) $ 2,434,626us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis $ 263,501us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Preferred stock, par value (in dollars per share) $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, number of shares authorized 50,000,000us-gaap_PreferredStockSharesAuthorized 50,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, number of shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, number of shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value (in dollars per share) $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, number of shares authorized 50,000,000us-gaap_CommonStockSharesAuthorized 50,000,000us-gaap_CommonStockSharesAuthorized
Common stock, number of shares issued 7,032,000us-gaap_CommonStockSharesIssued 7,032,000us-gaap_CommonStockSharesIssued
Common stock, number of shares outstanding 7,032,000us-gaap_CommonStockSharesOutstanding 7,032,000us-gaap_CommonStockSharesOutstanding