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SIGNIFICANT ACQUISITIONS (Details) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Apr. 29, 2011
Liberty Life
Apr. 30, 2011
Liberty Life
Athene Life Re
Dec. 31, 2010
United Investors
SIGNIFICANT ACQUISITIONS          
Aggregate purchase price     $ 225,000,000   $ 363,300,000
Capital invested     321,000,000    
Investment in surplus note issued by Athene Life Re       40,000,000  
Pro forma condensed consolidated results of operations          
Revenue 3,491,414,000 3,321,743,000      
Net income $ 324,793,000 $ 270,433,000