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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 $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Cummulative Non-credit Portion of Other Than Temporary Impairment [Abstract]    
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost $ 876,490,000 $ 1,014,390,000
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent (179,755,000) (189,277,000)
Change in Fair Value of Securities with Noncredit Other Than Temporary Impairment Losses 186,858,000 138,430,000
Fair Value of Securities with Noncredit Other Than Temporary Impairments 883,593,000 963,543,000
Assets Held by Insurance Regulators 27,200,000,000 23,900,000,000
Corporate Debt Securities [Member]
   
Cummulative Non-credit Portion of Other Than Temporary Impairment [Abstract]    
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost 10,599,000 3,347,000
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent (2,151,000) (2,151,000)
Change in Fair Value of Securities with Noncredit Other Than Temporary Impairment Losses 5,676,000 4,818,000
Fair Value of Securities with Noncredit Other Than Temporary Impairments 14,124,000 6,014,000
Residential Mortgage Backed Securities [Member]
   
Cummulative Non-credit Portion of Other Than Temporary Impairment [Abstract]    
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost 855,915,000 999,024,000
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent (177,604,000) (187,126,000)
Change in Fair Value of Securities with Noncredit Other Than Temporary Impairment Losses 171,514,000 125,502,000
Fair Value of Securities with Noncredit Other Than Temporary Impairments 849,825,000 937,400,000
Equity Securities [Member]
   
Cummulative Non-credit Portion of Other Than Temporary Impairment [Abstract]    
Securities with Noncredit Other Than Temporary Impairment at Amortized Cost 9,976,000 12,019,000
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 9,668,000 8,110,000
Fair Value of Securities with Noncredit Other Than Temporary Impairments 19,644,000 20,129,000
Investment Type Concentration Risk [Member]
   
Cummulative Non-credit Portion of Other Than Temporary Impairment [Abstract]    
Fair Value, Concentration of Risk, Investments $ 0  
Stockholders' Equity, Total [Member]
   
Cummulative Non-credit Portion of Other Than Temporary Impairment [Abstract]    
Threshold for Disclosure Percentage 10.00%