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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
	Mar. 31, 2013	Mar. 31, 2012
Investment Holdings [Line Items]
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost	$ 851,500	$ 876,490
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(178,708)	(179,755)
Change in Fair Value of Securities with Noncredit Other Than Temporary Impairment Losses	233,769	186,858
Fair Value of Securities with Noncredit Other Than Temporary Impairments	906,561	883,593
Corporate Debt Securities [Member]
Investment Holdings [Line Items]
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost	19,092	10,599
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	3,780	5,676
Fair Value of Securities with Noncredit Other Than Temporary Impairments	20,721	14,124
Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost	812,735	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	219,822	171,514
Fair Value of Securities with Noncredit Other Than Temporary Impairments	856,000	849,825
Equity Securities [Member]
Investment Holdings [Line Items]
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost	19,673	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	10,167	9,668
Fair Value of Securities with Noncredit Other Than Temporary Impairments	$ 29,840	$ 19,644

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- Definition

Change in Fair Value of Securities with Noncredit Other Than Temporary impairment Losses

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No definition available.

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- Definition

Represents the fair value of securities with noncredit other than temporary impairment losses as of the reporting date.

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No definition available.

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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.

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No definition available.

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- Definition

Amortized cost of securities with noncredit OTTI losses recognized during the reporting period.

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No definition available.

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