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Investments Cummlative Noncredit Portion of Other Than Temporary Impairment Recognized in Other Comprehensive Income and Change in Fair Value Since Other Than Temporary Impairment (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Cummulative Non-credit Portion of Other Than Temporary Impairment [Abstract] |  |
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost | $ 876,490,000 | $ 1,014,390,000
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent | (179,755,000) | (189,277,000)
Change in Fair Value of Securities with Noncredit Other Than Temporary Impairment Losses | 186,858,000 | 138,430,000
Fair Value of Securities with Noncredit Other Than Temporary Impairments | 883,593,000 | 963,543,000
Assets Held by Insurance Regulators | 27,200,000,000 | 23,900,000,000
Corporate Debt Securities [Member] |  |
Cummulative Non-credit Portion of Other Than Temporary Impairment [Abstract] |  |
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost | 10,599,000 | 3,347,000
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent | (2,151,000) | (2,151,000)
Change in Fair Value of Securities with Noncredit Other Than Temporary Impairment Losses | 5,676,000 | 4,818,000
Fair Value of Securities with Noncredit Other Than Temporary Impairments | 14,124,000 | 6,014,000
Residential Mortgage Backed Securities [Member] |  |
Cummulative Non-credit Portion of Other Than Temporary Impairment [Abstract] |  |
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost | 855,915,000 | 999,024,000
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent | (177,604,000) | (187,126,000)
Change in Fair Value of Securities with Noncredit Other Than Temporary Impairment Losses | 171,514,000 | 125,502,000
Fair Value of Securities with Noncredit Other Than Temporary Impairments | 849,825,000 | 937,400,000
Equity Securities [Member] |  |
Cummulative Non-credit Portion of Other Than Temporary Impairment [Abstract] |  |
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost | 9,976,000 | 12,019,000
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent | 0 | 0
Change in Fair Value of Securities with Noncredit Other Than Temporary Impairment Losses | 9,668,000 | 8,110,000
Fair Value of Securities with Noncredit Other Than Temporary Impairments | 19,644,000 | 20,129,000
Investment Type Concentration Risk [Member] |  |
Cummulative Non-credit Portion of Other Than Temporary Impairment [Abstract] |  |
Fair Value, Concentration of Risk, Investments | $ 0 |
Stockholders' Equity, Total [Member] |  |
Cummulative Non-credit Portion of Other Than Temporary Impairment [Abstract] |  |
Threshold for Disclosure Percentage | 10.00% |

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- Definition Change in Fair Value of Securities with Noncredit Other Than Temporary impairment Losses + References No definition available. + Details
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- Definition The cummulative amount of other than temporary impairment (OTTI) loss on a debt security, categorized as either Available-for-sale or Held-to-maturity, related to factors other than credit losses when the entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis that has been recognized since this accounting standard became effective. This amount which is attributable to the parent, is a portion of the deduction from the total impairment losses of Investments (before taxes) presented on the income statement. + References No definition available. + Details
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- Definition Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485772&loc=d3e22002-158495 + Details
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- Definition This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15A -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 107 -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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