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Fair Value Disclosures (Details 4) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Assets        
Fixed maturity securities $ 17,244,192 $ 16,200,950    
Mortgage loans on real estate 1,157,049 991,731    
Policy loans 1,250,238 1,260,400    
Funds withheld at interest 5,457,888 5,410,424    
Short-term investments 49,981 88,566    
Other invested assets 940,605 1,012,541    
Cash and cash equivalents 957,341 962,870 710,973 463,661
Accrued Investment Income 182,586 144,334    
Reinsurance ceded receivables 626,734 626,194    
Liabilities        
Interest-sensitive contract liabilities 13,352,601 8,394,468    
Collateral finance facility 651,936 652,032    
Fair Value Inputs Level 1 Member
       
Assets        
Fixed maturity securities 475,332 612,945    
Fair Value Inputs Level 2 Member
       
Assets        
Fixed maturity securities 15,466,678 14,212,340    
Fair Value Inputs Level 3 Member
       
Assets        
Fixed maturity securities 1,302,182 1,375,665    
Carrying Value [Member]
       
Assets        
Mortgage loans on real estate 1,157,049 991,731    
Policy loans 1,250,238 1,260,400    
Funds withheld at interest 5,457,888 5,410,424    
Short-term investments 46,277 41,895    
Other invested assets 497,238 500,681    
Cash and cash equivalents 578,746 458,348    
Accrued Investment Income 182,586 144,334    
Liabilities        
Interest-sensitive contract liabilities 11,486,794 6,203,001    
Long And Short Term Debt 1,414,969 1,414,688    
Collateral finance facility 651,936 652,032    
Estimated Fair Value [Member]
       
Assets        
Mortgage loans on real estate 1,254,696 1,081,924    
Policy loans 1,250,238 1,260,400    
Funds withheld at interest 6,229,065 6,041,984    
Short-term investments 46,277 41,895    
Other invested assets 508,730 503,293    
Cash and cash equivalents 578,746 458,348    
Accrued Investment Income 182,586 144,334    
Liabilities        
Interest-sensitive contract liabilities 11,553,027 6,307,779    
Long And Short Term Debt 1,481,569 1,462,329    
Collateral finance facility 423,475 390,900    
Estimated Fair Value [Member] | Fair Value Inputs Level 1 Member
       
Assets        
Mortgage loans on real estate 0      
Policy loans 0      
Funds withheld at interest 0      
Short-term investments 46,277      
Other invested assets 0      
Cash and cash equivalents 578,746      
Accrued Investment Income 0      
Liabilities        
Interest-sensitive contract liabilities 0      
Long And Short Term Debt 0      
Collateral finance facility 0      
Estimated Fair Value [Member] | Fair Value Inputs Level 2 Member
       
Assets        
Mortgage loans on real estate 0      
Policy loans 1,250,238      
Funds withheld at interest 0      
Short-term investments 0      
Other invested assets 18,900      
Cash and cash equivalents 0      
Accrued Investment Income 182,586      
Liabilities        
Interest-sensitive contract liabilities 0      
Long And Short Term Debt 0      
Collateral finance facility 0      
Estimated Fair Value [Member] | Fair Value Inputs Level 3 Member
       
Assets        
Mortgage loans on real estate 1,254,696      
Policy loans 0      
Funds withheld at interest 6,229,065      
Short-term investments 0      
Other invested assets 489,830      
Cash and cash equivalents 0      
Accrued Investment Income 0      
Liabilities        
Interest-sensitive contract liabilities 11,553,027      
Long And Short Term Debt 1,481,569      
Collateral finance facility $ 423,475