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Investments (Details 3) (USD $) | 12 Months Ended
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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

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