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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Assets        
Mortgage loans on real estate (net of valuation allowances) $ 3,377,039 $ 3,129,951    
Policy loans 1,445,410 1,468,796    
Funds withheld at interest 5,899,289 5,880,203    
Cash and cash equivalents 1,034,329 1,525,275 $ 1,335,661 $ 1,645,669
Short-term investments 195,979 558,284    
Other invested assets 1,682,143 1,298,120    
Accrued investment income 368,926 339,452    
Liabilities        
Interest-sensitive contract liabilities 14,024,012 13,663,873    
Short-term Debt 299,807 0    
Long-term debt 2,788,473 2,297,548    
Collateral finance and securitization notes 870,482 899,161    
Reported Value Measurement [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) 3,377,039 3,129,951    
Policy loans 1,445,410 1,468,796    
Funds withheld at interest [1] 5,987,794 5,956,380    
Cash and cash equivalents [2] 820,773 1,118,754    
Short-term investments [2] 35,078 27,511    
Other invested assets [2] 383,295 399,799    
Accrued investment income 368,926 339,452    
Liabilities        
Interest-sensitive contract liabilities [1] 10,058,118 9,746,870    
Short-term Debt 299,807      
Long-term debt 2,788,473      
Debt, Long-term and Short-term, Combined Amount   2,297,548    
Collateral finance and securitization notes 870,482 899,161    
Estimate of Fair Value Measurement [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) 3,502,098 3,197,808    
Policy loans 1,445,410 1,468,796    
Funds withheld at interest [1] 6,368,471 6,311,780    
Cash and cash equivalents [2] 820,773 1,118,754    
Short-term investments [2] 35,078 27,511    
Other invested assets [2] 409,054 444,342    
Accrued investment income 368,926 339,452    
Liabilities        
Interest-sensitive contract liabilities [1] 10,650,840 9,841,576    
Short-term Debt, Fair Value 308,457      
Long-term Debt, Fair Value 2,954,981      
Debt, Long-term and Short-term, Combined Amount   2,415,119    
Collateral finance and securitization notes 790,304 791,275    
Estimate of Fair Value Measurement [Member] | Net Asset Value [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) 0 0    
Policy loans 0 0    
Funds withheld at interest [1] 0 0    
Cash and cash equivalents [2] 0 0    
Short-term investments [2] 0 0    
Other invested assets [2] 282,514 293,599    
Accrued investment income 0 0    
Liabilities        
Interest-sensitive contract liabilities [1] 0 0    
Short-term Debt, Fair Value 0      
Long-term Debt, Fair Value 0      
Debt, Long-term and Short-term, Combined Amount   0    
Collateral finance and securitization notes 0 0    
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 1 Member        
Assets        
Mortgage loans on real estate (net of valuation allowances) 0 0    
Policy loans 0 0    
Funds withheld at interest [1] 0 0    
Cash and cash equivalents [2] 820,773 1,118,754    
Short-term investments [2] 35,078 27,511    
Other invested assets [2] 4,297 4,445    
Accrued investment income 0 0    
Liabilities        
Interest-sensitive contract liabilities [1] 0 0    
Short-term Debt, Fair Value 0      
Long-term Debt, Fair Value 0      
Debt, Long-term and Short-term, Combined Amount   0    
Collateral finance and securitization notes 0 0    
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 2 Member        
Assets        
Mortgage loans on real estate (net of valuation allowances) 0 0    
Policy loans 1,445,410 1,468,796    
Funds withheld at interest [1] 0 0    
Cash and cash equivalents [2] 0 0    
Short-term investments [2] 0 0    
Other invested assets [2] 36,151 34,886    
Accrued investment income 368,926 339,452    
Liabilities        
Interest-sensitive contract liabilities [1] 0 0    
Short-term Debt, Fair Value 0      
Long-term Debt, Fair Value 0      
Debt, Long-term and Short-term, Combined Amount   0    
Collateral finance and securitization notes 0 0    
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 3 Member        
Assets        
Mortgage loans on real estate (net of valuation allowances) 3,502,098 3,197,808    
Policy loans 0 0    
Funds withheld at interest [1] 6,368,471 6,311,780    
Cash and cash equivalents [2] 0 0    
Short-term investments [2] 0 0    
Other invested assets [2] 86,092 111,412    
Accrued investment income 0 0    
Liabilities        
Interest-sensitive contract liabilities [1] 10,650,840 9,841,576    
Short-term Debt, Fair Value 308,457      
Long-term Debt, Fair Value 2,954,981      
Debt, Long-term and Short-term, Combined Amount   2,415,119    
Collateral finance and securitization notes $ 790,304 $ 791,275    
[1] Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are embedded derivatives and are measured at fair value on a recurring basis.
[2] Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are measured at fair value on a recurring basis.