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Investments (Gross Unrealized Losses and Fair Value by Investment Category) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Fixed Maturity 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 | $ 10,578,987 | $ 2,716,900
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (613,506) | (33,982)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 276,727 | 443,515
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (27,836) | (33,919)
Available for sale securities, continuous unrealized loss position, total, fair value | 10,855,714 | 3,160,415
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (641,342) | (67,901)
Fixed Maturity Securities [Member] | 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 | 977 |
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (43) |
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 0 |
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 0 |
Available for sale securities, continuous unrealized loss position, total, fair value | 977 |
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (43) |
Fixed Maturity Securities [Member] | 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 | 1,130,979 | 973,728
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (78,915) | (3,468)
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 | 1,130,979 | 973,728
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (78,915) | (3,468)
Fixed Maturity Securities [Member] | 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 | 488,260 | 24,393
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (30,593) | (125)
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 | 488,260 | 24,393
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (30,593) | (125)
Fixed Maturity Securities [Member] | 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 | 26,985 |
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (2,792) |
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 0 |
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 0 |
Available for sale securities, continuous unrealized loss position, total, fair value | 26,985 |
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (2,792) |
Fixed Maturity Securities [Member] | 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 | 1,291,001 | 177,962
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (71,692) | (4,126)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 119,734 | 85,709
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (11,273) | (8,438)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,410,735 | 263,671
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (82,965) | (12,564)
Fixed Maturity Securities [Member] | 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 | 2,925,074 | 426,120
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (161,188) | (4,303)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 16,494 | 21,975
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (2,608) | (1,281)
Available for sale securities, continuous unrealized loss position, total, fair value | 2,941,568 | 448,095
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (163,796) | (5,584)
Fixed Maturity Securities [Member] | 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 | 1,568,088 | 221,044
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (83,013) | (5,187)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 30,766 | 39,224
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (2,673) | (4,212)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,598,854 | 260,268
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (85,686) | (9,399)
Fixed Maturity Securities [Member] | 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 | 336,683 | 101,790
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (20,153) | (784)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 0 | 10,250
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 0 | (208)
Available for sale securities, continuous unrealized loss position, total, fair value | 336,683 | 112,040
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (20,153) | (992)
Fixed Maturity Securities [Member] | 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 | 843,825 | 264,421
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (44,173) | (3,085)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 30,939 | 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (2,525) | 0
Available for sale securities, continuous unrealized loss position, total, fair value | 874,764 | 264,421
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (46,698) | (3,085)
Fixed Maturity Securities [Member] | 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 | 60,843 | 61,521
Held for investment securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (15,369) | (14,567)
Held for investment securities, continuous unrealized loss position, total, fair value | 60,843 | 61,521
Held for investment securities, continuous unrealized loss position, total, unrealized losses | (15,369) | (14,567)
Fixed Maturity Securities [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 12 months, fair value | 296,361 | 220,622
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (23,605) | (8,679)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 34,068 | 260,226
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (2,374) | (19,049)
Available for sale securities, continuous unrealized loss position, total, fair value | 330,429 | 480,848
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (25,979) | (27,728)
Fixed Maturity Securities [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 12 months, fair value | 1,268,293 | 161,582
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (79,425) | (1,983)
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 | 1,268,293 | 161,582
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (79,425) | (1,983)
Fixed Maturity Securities [Member] | 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 | 402,461 | 145,238
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (17,914) | (2,242)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 44,726 | 26,131
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (6,383) | (731)
Available for sale securities, continuous unrealized loss position, total, fair value | 447,187 | 171,369
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (24,297) | (2,973)
Equity Securities, Available For Sale [Member] | Services [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value |  | 0
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses |  | 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value |  | 8,722
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses |  | (1,403)
Available for sale securities, continuous unrealized loss position, total, fair value |  | 8,722
Available for sale securities, continuous unrealized loss position, total, unrealized losses |  | $ (1,403)

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- Definition This item represents the fair value of securities categorized as held-to-maturity 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=6872113&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=6872113&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant