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Investments Gross Unrealized Losses and Fair Value by Investment Category (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013 Securities	Dec. 31, 2012 Securities
Investment Holdings [Line Items]
Individual Securities with Unrealized Losses	803	198
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 24,789,087
Fixed Maturity Securities, Unrealized Loss Position, Classified as Investment Grade	95.00%	75.00%
Fixed Maturities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	9,657,496	2,716,900
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(511,213)	(33,982)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	206,992	443,515
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(19,174)	(33,919)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	9,864,488	3,160,415
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(530,387)	(67,901)
Fixed Maturities [Member] | US Treasury and Government [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	984
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(36)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	984
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(36)
Fixed Maturities [Member] | US Government Agencies Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,126,107	973,728
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(46,847)	(3,468)
Fixed Maturities [Member] | US Government Corporations and Agencies Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,126,107	973,728
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(46,847)	(3,468)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	0
Fixed Maturities [Member] | US States and Political Subdivisions Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	407,748	24,393
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(24,701)	(125)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	407,748	24,393
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(24,701)	(125)
Fixed Maturities [Member] | Foreign Government Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	27,269
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(2,525)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	27,269
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(2,525)
Fixed Maturities [Member] | Corporate Debt Securities [Member] | Corporate Debt Securities, Finance, Insurance, and Real Estate Sectors [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,295,619	177,962
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(67,115)	(4,126)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	84,262	85,709
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(7,814)	(8,438)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,379,881	263,671
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(74,929)	(12,564)
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	61,250	61,521
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(14,920)	(14,567)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	61,250	61,521
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	(14,920)	(14,567)
Fixed Maturities [Member] | Corporate Debt Securities [Member] | Corporate Debt Securities, Manufacturing, Construction, and Mining Sectors [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,631,633	426,120
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(135,270)	(4,303)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	12,079	21,975
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(1,797)	(1,281)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,643,712	448,095
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(137,067)	(5,584)
Fixed Maturities [Member] | Corporate Debt Securities [Member] | Corporate Debt Securities, Utilities and Related Sectors [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,334,828	221,044
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(64,359)	(5,187)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	29,728	39,224
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(3,728)	(4,212)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,364,556	260,268
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(68,087)	(9,399)
Fixed Maturities [Member] | Corporate Debt Securities [Member] | Corporate Debt Securities, Wholesale and Retail Trade Sectors [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	301,898	101,790
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(17,027)	(784)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	10,250
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	(208)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	301,898	112,040
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(17,027)	(992)
Fixed Maturities [Member] | Corporate Debt Securities [Member] | Corporate Debt Securities, Services, Media, and Other Sectors [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	747,156	264,421
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(39,559)	(3,085)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	747,156	264,421
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(39,559)	(3,085)
Fixed Maturities [Member] | Residential Mortgage Backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	293,301	220,622
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(13,905)	(8,679)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	58,100	260,226
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(2,488)	(19,049)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	351,401	480,848
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(16,393)	(27,728)
Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,064,758	161,582
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(83,053)	(1,983)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,064,758	161,582
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(83,053)	(1,983)
Fixed Maturities [Member] | Asset-backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	426,195	145,238
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(16,816)	(2,242)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	22,823	26,131
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(3,347)	(731)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	449,018	171,369
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(20,163)	(2,973)
Equity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		8,722
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		(1,403)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		8,722
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		(1,403)
Residential Mortgage Backed Securities, Alt-A Sector [Member] | Residential Mortgage Backed Securities [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	36
Available-for-sale Debt Securities, Amortized Cost Basis	341,400
Available-for-sale Securities, Fair Value Disclosure	$ 372,500

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