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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $)
12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Guaranteed minimum withdrawal benefits      
Mortality rate assumed (as a percent) 61.00%    
Goodwill $ 111,659,000 $ 114,758,000 $ 117,856,000
Period over which the entity has experienced improved credit and financial strength ratings (in years) 3    
Reserve investment yield assumptions, high end of the range (as a percent) 7.50%    
Reserve investment yield assumptions, low end of the range (as a percent) 2.00%    
Guaranteed minimum withdrawal benefits (GMWB) | Annuity account balances
     
Guaranteed minimum withdrawal benefits      
Guaranteed benefit liability, net $ 147,100,000