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Fair Value Disclosures (Details 5) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Assets        
Fixed maturity securities available-for-sale $ 22,291,614,000 $ 16,200,950,000    
Mortgage loans on real estate (net of allowances of $11,580,000 and $11,793,000 at December 31, 2012 and 2011, respectively) 2,300,587,000 991,731,000    
Policy loans 1,278,175,000 1,260,400,000    
Funds withheld at interest 5,594,182,000 5,410,424,000    
Short-term investments 288,082,000 88,566,000    
Other invested assets 1,159,543,000 1,012,541,000    
Cash and cash equivalents 1,259,892,000 962,870,000 463,661,000 512,027,000
Accrued investment income 201,344,000 144,334,000    
Reinsurance ceded receivables 620,901,000 626,194,000    
Liabilities [Abstract]        
Interest-sensitive contract liabilities 13,353,502,000 8,394,468,000    
Collateral finance facility 652,010,000 652,032,000    
Fair Value, Inputs, Level 1 [Member]
        
Assets        
Fixed maturity securities available-for-sale 533,349,000 612,945,000    
Fair Value, Inputs, Level 2 [Member]
        
Assets        
Fixed maturity securities available-for-sale 19,520,344,000 14,212,340,000    
Fair Value, Inputs, Level 3 [Member]
        
Assets        
Fixed maturity securities available-for-sale 2,237,921,000 1,375,665,000    
Carrying Value [Member]
        
Assets        
Mortgage loans on real estate (net of allowances of $11,580,000 and $11,793,000 at December 31, 2012 and 2011, respectively) 2,300,587,000 991,731,000    
Policy loans 1,278,175,000 1,260,400,000    
Funds withheld at interest 5,837,359,000 5,771,880,000    
Short-term investments 48,951,000 41,895,000    
Other invested assets 596,336,000 500,681,000    
Cash and cash equivalents 684,028,000 458,348,000    
Accrued investment income 201,344,000 144,334,000    
Liabilities [Abstract]        
Interest-sensitive contract liabilities 11,566,962,000 6,203,001,000    
Long And Short Term Debt 1,815,253,000 1,414,688,000    
Collateral finance facility 652,010,000 652,032,000    
Estimated Fair Value [Member]
        
Assets        
Mortgage loans on real estate (net of allowances of $11,580,000 and $11,793,000 at December 31, 2012 and 2011, respectively) 2,426,688,000 1,081,924,000    
Policy loans 1,278,175,000 1,260,400,000    
Funds withheld at interest 6,362,324,000 6,041,984,000    
Short-term investments 48,951,000 41,895,000    
Other invested assets 626,358,000 503,293,000    
Cash and cash equivalents 684,028,000 458,348,000    
Accrued investment income 201,344,000 144,334,000    
Liabilities [Abstract]        
Interest-sensitive contract liabilities 11,926,339,000 6,307,779,000    
Long And Short Term Debt 2,014,062,000 1,462,329,000    
Collateral finance facility 456,050,000 390,900,000    
Estimated Fair Value [Member] | Fair Value, Inputs, Level 1 [Member]
        
Assets        
Mortgage loans on real estate (net of allowances of $11,580,000 and $11,793,000 at December 31, 2012 and 2011, respectively) 0      
Policy loans 0      
Funds withheld at interest 0      
Short-term investments 48,951,000      
Other invested assets 0      
Cash and cash equivalents 684,028,000      
Accrued investment income 0      
Liabilities [Abstract]        
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 (net of allowances of $11,580,000 and $11,793,000 at December 31, 2012 and 2011, respectively) 0      
Policy loans 1,278,175,000      
Funds withheld at interest 0      
Short-term investments 0      
Other invested assets 32,250,000      
Cash and cash equivalents 0      
Accrued investment income 201,344,000      
Liabilities [Abstract]        
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 (net of allowances of $11,580,000 and $11,793,000 at December 31, 2012 and 2011, respectively) 2,426,688,000      
Policy loans 0      
Funds withheld at interest 6,362,324,000      
Short-term investments 0      
Other invested assets 594,108,000      
Cash and cash equivalents 0      
Accrued investment income 0      
Liabilities [Abstract]        
Interest-sensitive contract liabilities 11,926,339,000      
Long And Short Term Debt 2,014,062,000      
Collateral finance facility $ 456,050,000