Investments (Details 3) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of period	$ 63,947,000	$ 47,291,000	$ 47,905,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	1,962,000	8,349,000	7,359,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	10,186,000	9,059,000	9,346,000
Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Change In Status	(22,290,000)	0	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	(37,130,000)	(752,000)	(17,319,000)
Balance, end of period	$ 16,675,000	$ 63,947,000	$ 47,291,000

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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This item represents reductions in the amount of cumulative losses recognized in earnings for other than temporary impairments (OTTI) for which a portion of the impairment had been recognized in other comprehensive income (a component of shareholders' equity) due to a change in status of the impaired security because of a change in the entity's intent to either sell the impaired security or it has become more likely than not that the entity will be required to sell the security before recovery of its cost basis.

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