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Investments (Cumlative 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	Sep. 30, 2013	Dec. 31, 2012
Investment Holdings [Line Items]
Securities with noncredit other than temporary impairment, amortized cost	$ 717,287	$ 876,490
OTTI recognized in other comprehensive income	(176,334)	(179,755)
Change in fair value since OTTI was recognized	223,468	186,858
Securities with noncredit other than temporary impairment, fair value	764,421	883,593
Corporate Securities [Member]
Investment Holdings [Line Items]
Securities with noncredit other than temporary impairment, amortized cost	0	10,599
OTTI recognized in other comprehensive income	0	(2,151)
Change in fair value since OTTI was recognized	32	5,676
Securities with noncredit other than temporary impairment, fair value	32	14,124
Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Securities with noncredit other than temporary impairment, amortized cost	715,871	855,915
OTTI recognized in other comprehensive income	(176,334)	(177,604)
Change in fair value since OTTI was recognized	222,943	171,514
Securities with noncredit other than temporary impairment, fair value	762,480	849,825
Equity Securities, Available For Sale [Member]
Investment Holdings [Line Items]
Securities with noncredit other than temporary impairment, amortized cost	1,416	9,976
OTTI recognized in other comprehensive income	0	0
Change in fair value since OTTI was recognized	493	9,668
Securities with noncredit other than temporary impairment, fair value	$ 1,909	$ 19,644

X

- Definition

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

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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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