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Investments Fixed Maturity Securities by Contractual Maturity (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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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 | $ 41,968 |
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis | 623,552 |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis | 3,868,878 |
Available-for-sale Securities, Debt Maturities, after Ten Years through Twenty Years, Amortized Cost Basis | 5,294,593 |
Available-for-sale Securities, Debt Maturities, after Twenty Years, Amortized Cost | 6,944,881 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost | 16,773,872 |
Available-for-sale Debt Securities, Amortized Cost Basis | 20,136,014 | 16,980,279
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | 43,181 |
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 700,154 |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 4,262,988 |
Available-for-sale Securities, Debt Maturities, after Ten Years Through Twenty Years, Fair Value | 5,820,676 |
Available-for-sale Securities, Debt Maturities, after Twenty Years, Fair Value | 8,050,229 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value | 18,877,228 |
Available-for-sale Securities, Debt Securities | 22,410,492 | 18,464,109
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 | 76,048 |
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Net Carrying Amount | 76,048 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount | 76,048 |
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 | 63,759 |
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value | 63,759 |
Held-to-maturity Securities, Debt Maturities, Fair Value | 63,759 |
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 | 2,433,080 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, without Single Maturity Date, Fair Value | 2,565,959 |
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 | 78,682 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, without Single Maturity Date, Fair Value | 78,912 |
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 | 850,380 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available-for-sale Securities, without Single Maturity Date, Fair Value | 888,393 |
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 total of all debt securities grouped by maturity dates, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are classified neither as held-to-maturity nor trading securities. + References Reference 1: 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 2: 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. Reference 3: 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 + Details
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- Definition This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: 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 2: 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. Reference 3: 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 + Details
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