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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Fixed Maturity Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | $ 11,635,998 | $ 2,716,900
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (741,947) | (33,982)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 1,097,643 | 443,515
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (104,035) | (33,919)
Available for sale, continuous unrealized loss position, total, fair value | 12,733,641 | 3,160,415
Available for sale, continuous unrealized loss position, total, unrealized losses | (845,982) | (67,901)
Equity Securities, Available For Sale [Member] | Services [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 0
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses |  | 0
Available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 8,722
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses |  | (1,403)
Available for sale, continuous unrealized loss position, total, fair value |  | 8,722
Available for sale, continuous unrealized loss position, total, unrealized losses |  | (1,403)
United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 32,969 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (2,294) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 0 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | 0 |
Available for sale, continuous unrealized loss position, total, fair value | 32,969 |
Available for sale, continuous unrealized loss position, total, unrealized losses | (2,294) |
United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 692,320 | 973,728
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (88,671) | (3,468)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 467,309 | 0
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (32,691) | 0
Available for sale, continuous unrealized loss position, total, fair value | 1,159,629 | 973,728
Available for sale, continuous unrealized loss position, total, unrealized losses | (121,362) | (3,468)
United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 614,056 | 24,393
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (39,074) | (125)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 0 | 0
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | 0 | 0
Available for sale, continuous unrealized loss position, total, fair value | 614,056 | 24,393
Available for sale, continuous unrealized loss position, total, unrealized losses | (39,074) | (125)
Foreign Government Obligations [Member] | Fixed Maturity Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 26,298 |
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (3,462) |
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 0 |
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | 0 |
Available for sale, continuous unrealized loss position, total, fair value | 26,298 |
Available for sale, continuous unrealized loss position, total, unrealized losses | (3,462) |
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Finance, Insurance and Real Estate [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 1,690,846 | 177,962
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (92,426) | (4,126)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 153,037 | 85,709
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (12,873) | (8,438)
Available for sale, continuous unrealized loss position, total, fair value | 1,843,883 | 263,671
Available for sale, continuous unrealized loss position, total, unrealized losses | (105,299) | (12,564)
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Manufacturing, Construction and Mining [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 3,370,775 | 426,120
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (191,245) | (4,303)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 93,608 | 21,975
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (16,088) | (1,281)
Available for sale, continuous unrealized loss position, total, fair value | 3,464,383 | 448,095
Available for sale, continuous unrealized loss position, total, unrealized losses | (207,333) | (5,584)
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Utilities and Related Sectors [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 1,829,868 | 221,044
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (102,758) | (5,187)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 83,550 | 39,224
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (11,547) | (4,212)
Available for sale, continuous unrealized loss position, total, fair value | 1,913,418 | 260,268
Available for sale, continuous unrealized loss position, total, unrealized losses | (114,305) | (9,399)
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Wholesale/Retail Trade [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 428,407 | 101,790
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (25,189) | (784)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 17,687 | 10,250
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (1,992) | (208)
Available for sale, continuous unrealized loss position, total, fair value | 446,094 | 112,040
Available for sale, continuous unrealized loss position, total, unrealized losses | (27,181) | (992)
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Services, Media and Other [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 834,699 | 264,421
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (51,508) | (3,085)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 107,242 | 0
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (10,403) | 0
Available for sale, continuous unrealized loss position, total, fair value | 941,941 | 264,421
Available for sale, continuous unrealized loss position, total, unrealized losses | (61,911) | (3,085)
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Insurance [Member] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
Held for investment, continuous unrealized loss position, less than 12 months, fair value | 0 | 0
Held for investment, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 0
Held for investment, continuous unrealized loss position, 12 months or more, fair value | 60,840 | 61,521
Held for investment, continuous unrealized loss position, 12 months or more, unrealized losses | (15,415) | (14,567)
Held for investment, continuous unrealized loss position, total, fair value | 60,840 | 61,521
Held for investment, continuous unrealized loss position, total, unrealized losses | (15,415) | (14,567)
Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 309,599 | 220,622
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (41,080) | (8,679)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 31,739 | 260,226
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (2,103) | (19,049)
Available for sale, continuous unrealized loss position, total, fair value | 341,338 | 480,848
Available for sale, continuous unrealized loss position, total, unrealized losses | (43,183) | (27,728)
Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 1,450,143 | 161,582
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (83,814) | (1,983)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 51,099 | 0
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (6,001) | 0
Available for sale, continuous unrealized loss position, total, fair value | 1,501,242 | 161,582
Available for sale, continuous unrealized loss position, total, unrealized losses | (89,815) | (1,983)
Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 356,018 | 145,238
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (20,426) | (2,242)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 92,372 | 26,131
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (10,337) | (731)
Available for sale, continuous unrealized loss position, total, fair value | 448,390 | 171,369
Available for sale, continuous unrealized loss position, total, unrealized losses | $ (30,763) | $ (2,973)

X
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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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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are 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)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: 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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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on investments in held-to-maturity securities that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: 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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