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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
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Assets        
Mortgage loans on real estate (net of valuation allowances) $ 4,437,994 $ 4,400,533    
Policy loans 1,346,930 1,357,624    
Funds withheld at interest 6,005,892 6,083,388    
Cash and cash equivalents 1,510,407 1,303,524 $ 1,178,114 $ 1,200,718
Short-term investments 130,430 93,304    
Other invested assets 1,512,147 1,505,332    
Accrued investment income 408,338 392,721    
Liabilities        
Interest-sensitive contract liabilities 16,661,602 16,227,642    
Long-term debt 2,788,240 2,788,365    
Collateral finance and securitization notes 753,393 783,938    
Reported Value Measurement [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) 4,437,994 4,400,533    
Policy loans 1,346,930 1,357,624    
Funds withheld at interest [1] 5,865,791 5,955,092    
Cash and cash equivalents [2] 971,646 946,736    
Short-term investments [2] 71,931 42,558    
Other invested assets [2] 690,200 651,792    
Accrued investment income 408,338 392,721    
Liabilities        
Interest-sensitive contract liabilities [1] 13,169,951 12,683,872    
Long-term debt 2,788,240      
Debt, Long-term and Short-term, Combined Amount   2,788,365    
Collateral finance and securitization notes 753,393 783,938    
Estimate of Fair Value Measurement [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) 4,411,472 4,477,654    
Policy loans 1,346,930 1,357,624    
Funds withheld at interest [1] 6,098,479 6,275,623    
Cash and cash equivalents [2] 971,646 946,736    
Short-term investments [2] 71,931 42,558    
Other invested assets [2] 710,009 679,377    
Accrued investment income 408,338 392,721    
Liabilities        
Interest-sensitive contract liabilities [1] 13,151,162 12,917,243    
Long-term Debt, Fair Value 2,916,200      
Debt, Long-term and Short-term, Combined Amount   2,959,912    
Collateral finance and securitization notes 692,696 722,145    
Estimate of Fair Value Measurement [Member] | Net Asset Value [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances)   0    
Policy loans   0    
Funds withheld at interest [1]   0    
Cash and cash equivalents [2]   0    
Short-term investments [2]   0    
Other invested assets [2]   335,125    
Accrued investment income   0    
Liabilities        
Interest-sensitive contract liabilities [1]   0    
Debt, Long-term and Short-term, Combined Amount   0    
Collateral finance and securitization notes   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] 971,646 946,736    
Short-term investments [2] 71,931 42,558    
Other invested assets [2] 10,165 28,540    
Accrued investment income 0 0    
Liabilities        
Interest-sensitive contract liabilities [1] 0 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 1,346,930 1,357,624    
Funds withheld at interest [1] 0 0    
Cash and cash equivalents [2] 0 0    
Short-term investments [2] 0 0    
Other invested assets [2] 68,903 67,778    
Accrued investment income 408,338 392,721    
Liabilities        
Interest-sensitive contract liabilities [1] 0 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) 4,411,472 4,477,654    
Policy loans 0 0    
Funds withheld at interest [1] 6,098,479 6,275,623    
Cash and cash equivalents [2] 0 0    
Short-term investments [2] 0 0    
Other invested assets [2] 283,205 247,934    
Accrued investment income 0 0    
Liabilities        
Interest-sensitive contract liabilities [1] 13,151,162 12,917,243    
Long-term Debt, Fair Value 2,916,200      
Debt, Long-term and Short-term, Combined Amount   2,959,912    
Collateral finance and securitization notes 692,696 $ 722,145    
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 3 Member | Net Asset Value [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) 0      
Policy loans 0      
Funds withheld at interest [1] 0      
Cash and cash equivalents [2] 0      
Short-term investments [2] 0      
Other invested assets [2] 347,736      
Accrued investment income 0      
Liabilities        
Interest-sensitive contract liabilities [1] 0      
Long-term Debt, Fair Value 0      
Collateral finance and securitization notes $ 0      
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