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Fair Value (Schedule of Gain (Loss) Due to Change in Fair Value Level 3 Assets) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Level 3 liabilities     $ 0 $ 0
Impact on income relating to Level 3 securities 0 0    
Corporate [Member] | Level 3 [Member] | Fixed Maturities [Member]
       
Net realized investment gains       100,000
Total       100,000
Level 3 [Member]
       
Other-than-temporary impairments     (500,000) (300,000)
Net realized investment gains       100,000
Total       (200,000)
Level 3 [Member] | Equity Securities [Member]
       
Other-than-temporary impairments     (500,000) (300,000)
Total       $ (300,000)