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Investments Schedule of Amortized Cost and Fair Value of Fixed Maturity and Equity Securities (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Investment Holdings [Line Items]      
Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities $ 0 $ 1,688,329,000  
Proceeds From Calls of United States Government Sponsored Agency Securities 1,000,000,000 2,800,000,000  
Available-for-sale Securities, Amortized Cost Basis 24,789,087,000   21,957,027,000
Fixed maturity securities, held for investment, at amortized cost 76,170,000   76,088,000
Fixed Income Securities with Call Features 30.00%    
Fixed Income Securities with Call Features, Callable During Next 12 Months 5.00%    
Fixed Income Securities with Call Features, Callable During Next 12 Months Amount 1,300,000,000    
United States Government Agency Securities, Short-term, Callable During Next 12 Months 500,600,000    
United States Government Agencies, Short-term, Callable During Next 12 Months, Book Yield 0.75%    
United States Government Agencies, Short-term, Callable During Next 12 Months, Future Book Yield 3.75%    
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 76,170,000   76,088,000
Held-to-maturity Securities, Unrecognized Holding Gain 0   0
Held-to-maturity Securities, Unrecognized Holding Loss (14,920,000)   (14,567,000)
Held-to-maturity Securities, Fair Value Disclosure 61,250,000   61,521,000
Fixed Maturities [Member] | Available-for-sale Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 24,789,087,000   21,957,027,000
Available-for-sale Securities, Gross Unrealized Gains 1,286,942,000   2,283,010,000
Available-for-sale Securities, Gross Unrealized Losses (530,387,000)   (67,901,000)
Available-for-sale Securities, Fair Value Disclosure 25,545,642,000   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 3,299,732,000   3,116,678,000
Available-for-sale Securities, Gross Unrealized Gains 268,127,000   461,770,000
Available-for-sale Securities, Gross Unrealized Losses (24,701,000)   (125,000)
Available-for-sale Securities, Fair Value Disclosure 3,543,158,000   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 86,106,000   86,099,000
Available-for-sale Securities, Gross Unrealized Gains 9,230,000   19,160,000
Available-for-sale Securities, Gross Unrealized Losses (2,525,000)   0
Available-for-sale Securities, Fair Value Disclosure 92,811,000   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 4,607,000   4,590,000
Available-for-sale Securities, Gross Unrealized Gains 367,000   564,000
Available-for-sale Securities, Gross Unrealized Losses (36,000)   0
Available-for-sale Securities, Fair Value Disclosure 4,938,000   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 15,527,755,000   12,930,173,000
Available-for-sale Securities, Gross Unrealized Gains 808,241,000   1,568,223,000
Available-for-sale Securities, Gross Unrealized Losses (336,669,000)   (31,624,000)
Available-for-sale Securities, Fair Value Disclosure 15,999,327,000   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 2,337,399,000   2,743,537,000
Available-for-sale Securities, Gross Unrealized Gains 167,051,000   172,304,000
Available-for-sale Securities, Gross Unrealized Losses (16,393,000)   (27,728,000)
Available-for-sale Securities, Fair Value Disclosure 2,488,057,000   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 1,304,028,000   354,870,000
Available-for-sale Securities, Gross Unrealized Gains 1,714,000   5,095,000
Available-for-sale Securities, Gross Unrealized Losses (83,053,000)   (1,983,000)
Available-for-sale Securities, Fair Value Disclosure 1,222,689,000   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 987,562,000   957,291,000
Available-for-sale Securities, Gross Unrealized Gains 27,416,000   44,190,000
Available-for-sale Securities, Gross Unrealized Losses (20,163,000)   (2,973,000)
Available-for-sale Securities, Fair Value Disclosure 994,815,000   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 1,241,898,000   1,763,789,000
Available-for-sale Securities, Gross Unrealized Gains 4,796,000   11,704,000
Available-for-sale Securities, Gross Unrealized Losses (46,847,000)   (3,468,000)
Available-for-sale Securities, Fair Value Disclosure 1,199,847,000   1,772,025,000
Equity Securities [Member] | Available-for-sale Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 8,915,000   44,598,000
Available-for-sale Securities, Gross Unrealized Gains 875,000   10,227,000
Available-for-sale Securities, Gross Unrealized Losses 0   (1,403,000)
Available-for-sale Securities, Fair Value Disclosure $ 9,790,000   $ 53,422,000