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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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- Definition Amount of the excess of amortized cost basis over fair value of securities in a loss position and categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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