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Investments Fixed Maturity Securities by Contractual Maturity (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis | $ 100,860 |
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis | 737,142 |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis | 5,706,584 |
Available-for-sale Securities, Debt Maturities, after Ten Years through Twenty Years, Amortized Cost Basis | 5,804,473 |
Available-for-sale Securities, Debt Maturities, after Twenty Years, Amortized Cost | 6,953,594 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost | 19,302,653 |
Available-for-sale Debt Securities, Amortized Cost Basis | 23,513,179 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | 105,574 |
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 833,797 |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 6,093,251 |
Available-for-sale Securities, Debt Maturities, after Ten Years Through Twenty Years, Fair Value | 6,322,926 |
Available-for-sale Securities, Debt Maturities, after Twenty Years, Fair Value | 7,815,035 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value | 21,170,583 |
Available-for-sale Securities, Debt Securities | 25,609,218 | 24,172,136
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount | 0 |
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount | 0 |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount | 0 |
Held-to-maturity Securities, Debt Maturities, after Ten Years Through Twenty Years, Net Carrying Amount | 0 |
Held-to-maturity Securities, Debt Maturities, after Twenty Years, Net Carrying Amount | 76,129 |
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Net Carrying Amount | 76,129 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount | 76,129 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value | 0 |
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value | 0 |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 0 |
Held-to-maturity Securities, Debt Maturities, after Ten Years Through Twenty Years, Fair Value | 0 |
Held-to-maturity Securities, Debt Maturities, after Twenty Years, Fair Value | 62,173 |
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value | 62,173 |
Held-to-maturity Securities, Debt Maturities, Fair Value | 62,173 |
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available-for-sale Securities, without Single Maturity Date, Amortized Cost | 2,488,435 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, without Single Maturity Date, Fair Value | 2,668,454 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value | 0 |
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available-for-sale Securities, without Single Maturity Date, Amortized Cost | 742,965 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, without Single Maturity Date, Fair Value | 748,601 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value | 0 |
Asset-backed Securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available-for-sale Securities, without Single Maturity Date, Amortized Cost | 979,126 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, without Single Maturity Date, Fair Value | 1,021,580 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value | $ 0 |

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph c -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
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph b -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
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -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
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph a -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
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- Definition Amount of available-for-sale debt securities at fair value maturing in the next fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph a -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
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -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
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 137 -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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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
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