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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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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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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.

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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).

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