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Investments Changes in Net Unrealized Gains/Losses on Investments (Details) (USD $)
 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
Fixed Maturities [Member]
Mar. 31, 2012
Fixed Maturities [Member]
Mar. 31, 2013
Equity Securities [Member]
Mar. 31, 2012
Equity Securities [Member]
Dec. 31, 2013
Residential Mortgage Backed Securities, Alt-A Sector [Member]
Residential Mortgage Backed Securities [Member]
Securities
Mar. 31, 2013
Residential Mortgage Backed Securities, Alt-A Sector [Member]
Residential Mortgage Backed Securities [Member]
Alt A Residential Mortgage Backed Securities [Abstract]                  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions               36  
Available-for-sale Debt Securities, Amortized Cost Basis $ 23,513,179,000             $ 358,300,000  
Available-for-sale Securities, Fair Value Disclosure                 378,600,000
Fixed Maturity Securities, Unrealized Loss Position, Classified as Investment Grade 76.00%   75.00%            
Change in Net Unrealized Gain/Loss, Fixed Maturity Securities, Held for Investment       611,000 10,189,000        
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes (116,851,000) (210,664,000)   (119,070,000) (215,088,000) 2,219,000 4,424,000    
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax (25,144,000) (48,482,000)              
Adjustment for Effect on Other Balance Sheet Accounts [Abstract]                  
Adjustments for Assumed Changes in Amortization of Deferred Policy Acquisition Costs and Deferred Sales Inducements 78,168,000 136,078,000              
Increase (Decrease) in Deferred Income Taxes 13,539,000 26,104,000              
Changes Net Unrealized Gains/Losses for Adjustments in Deferred Policy Acquisition Costs, Deferred Sales Inducements, Deferred Tax Valuation Allowances, and Deferred Income Taxes 91,707,000 162,182,000              
Proceeds from Sale of Available-for-sale Securities       380,400,000 51,700,000        
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities $ 937,343,000 $ 965,283,000   $ 600,000,000 $ 900,000,000