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Investments Gross Unrealized Losses and Fair Value by Investment Category (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Investment Holdings [Line Items]
Individual Securities with Unrealized Losses		211	198
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis		$ 23,513,179
Fixed Maturity Securities, Unrealized Loss Position, Classified as Investment Grade		76.00%	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		3,228,482	2,716,900
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		(52,762)	(33,982)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		247,252	443,515
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		(17,708)	(33,919)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		3,475,734	3,160,415
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		(70,470)	(67,901)
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, Less than Twelve Months, Fair Value		874,724
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		(3,887)
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		874,724	973,728
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		(3,887)	(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			973,728
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses			(3,468)
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
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		62,810	24,393
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		(836)	(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		62,810	24,393
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		(836)	(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		14,270
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		(216)
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		14,270
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		(216)
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		379,876	177,962
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		(7,483)	(4,126)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	68,378		85,709
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		(6,127)	(8,438)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		448,254	263,671
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		(13,610)	(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		62,173	61,521
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		(13,956)	(14,567)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value		62,173	61,521
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses		(13,956)	(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		622,394	426,120
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		(13,677)	(4,303)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	11,980		21,975
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		(1,896)	(1,281)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		634,374	448,095
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		(15,573)	(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		362,337	221,044
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		(10,870)	(5,187)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	39,887		39,224
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		(3,533)	(4,212)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		402,224	260,268
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		(14,403)	(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		95,328	101,790
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		(1,586)	(784)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	10,263		10,250
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		(193)	(208)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		105,591	112,040
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		(1,779)	(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		370,926	264,421
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		(5,222)	(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		370,926	264,421
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		(5,222)	(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		62,181	220,622
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		(2,251)	(8,679)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	92,736		260,226
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		(3,759)	(19,049)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		154,917	480,848
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		(6,010)	(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		216,149	161,582
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		(3,136)	(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		216,149	161,582
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		(3,136)	(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		167,487	145,238
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		(3,598)	(2,242)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	24,008		26,131
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		(2,200)	(731)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		191,495	171,369
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		(5,798)	(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)

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