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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 $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2011
Investment Holdings [Line Items] |  |  |  |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | $ (128,513) | $ (122,954) | $ (128,513) | $ (122,954) | $ (134,027) | $ (129,813) | $ (121,976) | $ (119,095)
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost | 766,161 |  | 766,161 |  | 876,490 |  |  |
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent |  |  | (176,557) |  | (179,755) |  |  |
Change in Fair Value of Securities with Noncredit Other Than Temporary Impairment Losses |  |  | 236,865 |  | 186,858 |  |  |
Fair Value of Securities with Noncredit Other Than Temporary Impairments | 826,469 |  | 826,469 |  | 883,593 |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment | (2,775) | (47) | (4,536) | (47) |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses | 0 | (931) | (1,048) | (3,812) |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold | 4,075 | 0 | 11,098 | 0 |  |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost | 0 |  | 0 |  | 10,599 |  |  |
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent |  |  | 0 |  | (2,151) |  |  |
Change in Fair Value of Securities with Noncredit Other Than Temporary Impairment Losses |  |  | 24 |  | 5,676 |  |  |
Fair Value of Securities with Noncredit Other Than Temporary Impairments | 24 |  | 24 |  | 14,124 |  |  |
Residential Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost | 764,746 |  | 764,746 |  | 855,915 |  |  |
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent |  |  | (176,557) |  | (177,604) |  |  |
Change in Fair Value of Securities with Noncredit Other Than Temporary Impairment Losses |  |  | 236,236 |  | 171,514 |  |  |
Fair Value of Securities with Noncredit Other Than Temporary Impairments | 824,425 |  | 824,425 |  | 849,825 |  |  |
Equity Securities [Member] |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost | 1,415 |  | 1,415 |  | 9,976 |  |  |
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 |  |  | 605 |  | 9,668 |  |  |
Fair Value of Securities with Noncredit Other Than Temporary Impairments | $ 2,020 |  | $ 2,020 |  | $ 19,644 |  |  |

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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 This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which a previous OTTI was recognized and the investor does not intend to sell the debt security and it is not more likely than not that the investor will be required to sell the debt security before recovery of its amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27340-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 18B -Subparagraph e -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 The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27340-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 18B -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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 18B -Subparagraph g -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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