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Investments Cumulative Noncredit Portion of Other Than Temporary Impairment Recognized in Other Comprehensive Income and Change in Fair Value Since Other Than Temporary Impairment (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011
Cumulative Noncredit Portion of Other Than Temporary Impairment [Abstract] |  |
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost | $ 912,607 | $ 1,014,390
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent | (185,888) | (189,277)
Change in Fair Value of Securities with Noncredit Other Than Temporary Impairment Losses | 183,756 | 138,430
Fair Value of Securities with Noncredit Other Than Temporary Impairments | 910,475 | 963,543
Corporate Debt Securities [Member] |  |
Cumulative Noncredit Portion of Other Than Temporary Impairment [Abstract] |  |
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost | 3,515 | 3,347
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent | (2,151) | (2,151)
Change in Fair Value of Securities with Noncredit Other Than Temporary Impairment Losses | 5,651 | 4,818
Fair Value of Securities with Noncredit Other Than Temporary Impairments | 7,015 | 6,014
Residential Mortgage Backed Securities [Member] |  |
Cumulative Noncredit Portion of Other Than Temporary Impairment [Abstract] |  |
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost | 899,116 | 999,024
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent | (183,737) | (187,126)
Change in Fair Value of Securities with Noncredit Other Than Temporary Impairment Losses | 166,604 | 125,502
Fair Value of Securities with Noncredit Other Than Temporary Impairments | 881,983 | 937,400
Equity Securities [Member] |  |
Cumulative Noncredit Portion of Other Than Temporary Impairment [Abstract] |  |
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost | 9,976 | 12,019
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 | 11,501 | 8,110
Fair Value of Securities with Noncredit Other Than Temporary Impairments | $ 21,477 | $ 20,129

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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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- Details
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- Definition Represents the fair value of securities with noncredit other than temporary impairment losses as of the reporting date. + 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 Amortized cost of securities with noncredit OTTI losses recognized during the reporting period. + References No definition available. + Details
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