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Investments (Details) - Investment Fund Consolidation (USD $)
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Investment Fund Consolidation [Line Items]        
Fixed maturities, at fair value $ 27,426,293,000 $ 26,190,025,000    
Cost or Amortized cost of Fixed maturities 26,150,520,000 25,771,715,000    
Cash and cash equivalents 3,197,305,000 3,825,125,000 3,176,283,000 3,022,868,000
Other liabilities 1,001,298,000 770,945,000    
Non-controlling interest in equity of consolidated subsidiaries 1,346,382,000 1,344,472,000    
Five Oaks Investment Corp [Member]
       
Investment Fund Consolidation [Line Items]        
Investment amount 25,000,000      
Percentage ownership 94.00%      
Cash and cash equivalents 6,800,000      
Other liabilities 76,800,000      
Non-controlling interest in equity of consolidated subsidiaries 1,900,000      
Securities pledged as collateral 91,100,000      
Five Oaks Investment Corp [Member] | Maximum
       
Investment Fund Consolidation [Line Items]        
Investment Fund Maximum Leverage Permitted 79,500,000      
Five Oaks Investment Corp [Member] | Residential Mortgage Backed Securities Member
       
Investment Fund Consolidation [Line Items]        
Fixed maturities, at fair value 103,300,000      
Cost or Amortized cost of Fixed maturities $ 95,400,000