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Investments Schedule of Amortized Cost and Fair Value of Fixed Maturity and Equity Securities (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2013
Investment Holdings [Line Items]        
Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities $ 0 $ 1,140,816,000 $ 1,140,816,000  
Proceeds From Calls of United States Government Sponsored Agency Securities 300,000,000 1,900,000,000    
Available-for-sale Securities, Amortized Cost Basis 23,513,179,000   21,957,027,000  
Fixed maturity securities, held for investment, at amortized cost 76,129,000   76,088,000  
Fixed Income Securities with Call Features       31.00%
Fixed Income Securities with Call Features, Currently Callable       0.30%
Fixed Income Securities with Call Features, Currently Callable Amount       100,000,000
Fixed Income Securities with Call Features, Callable During Next 12 Months       8.00%
Fixed Income Securities with Call Features, Callable During Next 12 Months Amount       1,800,000,000
United States Government Agency Securities, Short-term, Callable During Next 12 Months 522,265,000      
United States Government Agencies, Short-term, Callable During Next 12 Months, Book Yield 0.76%      
Fixed Maturities [Member] | Held-to-maturity Securities [Member] | Corporate Debt Securities [Member]
       
Investment Holdings [Line Items]        
Fixed maturity securities, held for investment, at amortized cost 76,129,000   76,088,000  
Held-to-maturity Securities, Unrecognized Holding Gain 0   0  
Held-to-maturity Securities, Unrecognized Holding Loss (13,956,000)   (14,567,000)  
Held-to-maturity Securities, Fair Value Disclosure 62,173,000   61,521,000  
Fixed Maturities [Member] | Available-for-sale Securities [Member]
       
Investment Holdings [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 23,513,179,000   21,957,027,000  
Available-for-sale Securities, Gross Unrealized Gains 2,166,509,000   2,283,010,000  
Available-for-sale Securities, Gross Unrealized Losses (70,470,000)   (67,901,000)  
Available-for-sale Securities, Fair Value Disclosure 25,609,218,000   24,172,136,000  
Fixed Maturities [Member] | Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
       
Investment Holdings [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 3,191,793,000   3,116,678,000  
Available-for-sale Securities, Gross Unrealized Gains 466,207,000   461,770,000  
Available-for-sale Securities, Gross Unrealized Losses (836,000)   (125,000)  
Available-for-sale Securities, Fair Value Disclosure 3,657,164,000   3,578,323,000  
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member]
       
Investment Holdings [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 86,102,000   86,099,000  
Available-for-sale Securities, Gross Unrealized Gains 14,574,000   19,160,000  
Available-for-sale Securities, Gross Unrealized Losses (216,000)   0  
Available-for-sale Securities, Fair Value Disclosure 100,460,000   105,259,000  
Fixed Maturities [Member] | Available-for-sale Securities [Member] | US Treasury Securities [Member]
       
Investment Holdings [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 4,091,000   4,590,000  
Available-for-sale Securities, Gross Unrealized Gains 525,000   564,000  
Available-for-sale Securities, Gross Unrealized Losses 0   0  
Available-for-sale Securities, Fair Value Disclosure 4,616,000   5,154,000  
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Corporate Debt Securities [Member]
       
Investment Holdings [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 14,167,049,000   12,930,173,000  
Available-for-sale Securities, Gross Unrealized Gains 1,434,504,000   1,568,223,000  
Available-for-sale Securities, Gross Unrealized Losses (50,587,000)   (31,624,000)  
Available-for-sale Securities, Fair Value Disclosure 15,550,966,000   14,466,772,000  
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Residential Mortgage Backed Securities [Member]
       
Investment Holdings [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 2,488,435,000   2,743,537,000  
Available-for-sale Securities, Gross Unrealized Gains 186,029,000   172,304,000  
Available-for-sale Securities, Gross Unrealized Losses (6,010,000)   (27,728,000)  
Available-for-sale Securities, Fair Value Disclosure 2,668,454,000   2,888,113,000  
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member]
       
Investment Holdings [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 742,965,000   354,870,000  
Available-for-sale Securities, Gross Unrealized Gains 8,772,000   5,095,000  
Available-for-sale Securities, Gross Unrealized Losses (3,136,000)   (1,983,000)  
Available-for-sale Securities, Fair Value Disclosure 748,601,000   357,982,000  
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Asset-backed Securities [Member]
       
Investment Holdings [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 979,126,000   957,291,000  
Available-for-sale Securities, Gross Unrealized Gains 48,252,000   44,190,000  
Available-for-sale Securities, Gross Unrealized Losses (5,798,000)   (2,973,000)  
Available-for-sale Securities, Fair Value Disclosure 1,021,580,000   998,508,000  
Fixed Maturities [Member] | Available-for-sale Securities [Member] | US Government Corporations and Agencies Securities [Member]
       
Investment Holdings [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 1,853,618,000   1,763,789,000  
Available-for-sale Securities, Gross Unrealized Gains 7,646,000   11,704,000  
Available-for-sale Securities, Gross Unrealized Losses (3,887,000)   (3,468,000)  
Available-for-sale Securities, Fair Value Disclosure 1,857,377,000   1,772,025,000  
Equity Securities [Member] | Available-for-sale Securities [Member]
       
Investment Holdings [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 44,172,000   44,598,000  
Available-for-sale Securities, Gross Unrealized Gains 11,043,000   10,227,000  
Available-for-sale Securities, Gross Unrealized Losses 0   (1,403,000)  
Available-for-sale Securities, Fair Value Disclosure $ 55,215,000   $ 53,422,000