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Investments (Gross Unrealized Losses and Fair Value by Investment Category) (Details) (Fixed Maturity Securities [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | $ 7,990,016 | $ 11,635,998
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (344,643) | (741,947)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 898,132 | 1,097,643
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (54,825) | (104,035)
Available for sale securities, continuous unrealized loss position, total, fair value | 8,888,148 | 12,733,641
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (399,468) | (845,982)
United States Government Full Faith and Credit [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 33,386 | 32,969
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (1,210) | (2,294)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 0 | 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 0 | 0
Available for sale securities, continuous unrealized loss position, total, fair value | 33,386 | 32,969
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (1,210) | (2,294)
United States Government Sponsored Agencies [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 618,888 | 692,320
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (58,157) | (88,671)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 340,909 | 467,309
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (9,091) | (32,691)
Available for sale securities, continuous unrealized loss position, total, fair value | 959,797 | 1,159,629
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (67,248) | (121,362)
United States Municipalities, States and Territories [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 288,578 | 614,056
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (14,671) | (39,074)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 0 | 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 0 | 0
Available for sale securities, continuous unrealized loss position, total, fair value | 288,578 | 614,056
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (14,671) | (39,074)
Foreign Government Obligations [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 77,271 | 26,298
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (2,472) | (3,462)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 0 | 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 0 | 0
Available for sale securities, continuous unrealized loss position, total, fair value | 77,271 | 26,298
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (2,472) | (3,462)
Corporate Securities [Member] | Finance, Insurance and Real Estate [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 1,126,695 | 1,690,846
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (40,893) | (92,426)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 139,455 | 153,037
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (9,454) | (12,873)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,266,150 | 1,843,883
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (50,347) | (105,299)
Corporate Securities [Member] | Manufacturing, Construction and Mining [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 2,267,589 | 3,370,775
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (76,780) | (191,245)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 131,419 | 93,608
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (14,578) | (16,088)
Available for sale securities, continuous unrealized loss position, total, fair value | 2,399,008 | 3,464,383
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (91,358) | (207,333)
Corporate Securities [Member] | Utilities and Related Sectors [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 933,917 | 1,829,868
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (40,959) | (102,758)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 101,402 | 83,550
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (9,215) | (11,547)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,035,319 | 1,913,418
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (50,174) | (114,305)
Corporate Securities [Member] | Wholesale/Retail Trade [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 204,346 | 428,407
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (11,286) | (25,189)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 13,850 | 17,687
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (840) | (1,992)
Available for sale securities, continuous unrealized loss position, total, fair value | 218,196 | 446,094
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (12,126) | (27,181)
Corporate Securities [Member] | Services, Media and Other [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 566,481 | 834,699
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (17,716) | (51,508)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 97,230 | 107,242
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (6,692) | (10,403)
Available for sale securities, continuous unrealized loss position, total, fair value | 663,711 | 941,941
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (24,408) | (61,911)
Corporate Securities [Member] | Insurance [Member] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
Held for investment securities, continuous unrealized loss position, less than 12 months, fair value | 0 | 0
Held for investment securities, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 0
Held for investment securities, continuous unrealized loss position, 12 months or longer, fair value | 64,920 | 60,840
Held for investment securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (11,378) | (15,415)
Held for investment securities, continuous unrealized loss position, total, fair value | 64,920 | 60,840
Held for investment securities, continuous unrealized loss position, total, unrealized losses | (11,378) | (15,415)
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 385,500 | 309,599
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (22,132) | (41,080)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 1,080 | 31,739
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (580) | (2,103)
Available for sale securities, continuous unrealized loss position, total, fair value | 386,580 | 341,338
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (22,712) | (43,183)
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 1,169,178 | 1,450,143
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (43,622) | (83,814)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 27,135 | 51,099
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (885) | (6,001)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,196,313 | 1,501,242
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (44,507) | (89,815)
Other Asset Backed Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 318,187 | 356,018
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (14,745) | (20,426)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 45,652 | 92,372
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (3,490) | (10,337)
Available for sale securities, continuous unrealized loss position, total, fair value | 363,839 | 448,390
Available for sale securities, continuous unrealized loss position, total, unrealized losses | $ (18,235) | $ (30,763)

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- Definition Amount of unrealized loss on securities classified as available-for-sale. + 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=27724398&loc=d3e27290-111563 + Details
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