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Fair Value Disclosures (Narrative) (USD $)
 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Impaired commercial mortgages [Member]
Jun. 30, 2011
Impaired commercial mortgages [Member]
Jun. 30, 2012
Impaired commercial mortgages [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Percentage Of Fixed Maturity Securities Classified As Level 3   7.60% 8.50%      
Fair Value Measured On Nonrecurring Basis Gains (Losses) $ 400,000     $ 1,000,000 $ (700,000) $ (2,700,000)
Commercial Mortgage Loans Carrying Value Non Recurring       $ 23,400,000 $ 15,300,000 $ 23,400,000