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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, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Assets        
Mortgage loans on real estate (net of valuation allowances) $ 3,871,309 $ 3,775,522    
Policy loans 1,402,940 1,427,602    
Funds withheld at interest 5,943,450 5,875,919    
Cash and cash equivalents 1,178,114 1,200,718 $ 1,502,082 $ 1,525,275
Short-term investments 54,288 76,710    
Other invested assets 1,429,175 1,591,940    
Accrued investment income 360,225 347,173    
Liabilities        
Interest-sensitive contract liabilities 14,039,919 14,029,354    
Long-term debt 2,788,619 3,088,635    
Collateral finance and securitization notes 825,526 840,700    
Reported Value Measurement [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) 3,871,309 3,775,522    
Policy loans 1,402,940 1,427,602    
Funds withheld at interest [1] 5,895,159 5,893,381    
Cash and cash equivalents [2] 810,552 862,117    
Short-term investments [2] 29,359 32,469    
Other invested assets [2] 523,365 477,132    
Accrued investment income 360,225 347,173    
Liabilities        
Interest-sensitive contract liabilities [1] 10,279,136 10,225,099    
Long-term debt 2,788,619      
Debt, Long-term and Short-term, Combined Amount   3,088,635    
Collateral finance and securitization notes 825,526 840,700    
Estimate of Fair Value Measurement [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) 3,909,506 3,786,987    
Policy loans 1,402,940 1,427,602    
Funds withheld at interest [1] 6,202,931 6,193,166    
Cash and cash equivalents [2] 810,552 862,117    
Short-term investments [2] 29,359 32,469    
Other invested assets [2] 555,707 510,640    
Accrued investment income 360,225 347,173    
Liabilities        
Interest-sensitive contract liabilities [1] 10,237,636 10,234,544    
Long-term Debt, Fair Value 2,964,610      
Debt, Long-term and Short-term, Combined Amount   3,186,173    
Collateral finance and securitization notes 732,353 745,805    
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]   296,773    
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] 810,552 862,117    
Short-term investments [2] 29,359 32,469    
Other invested assets [2] 26,802 26,294    
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 1,402,940 1,427,602    
Funds withheld at interest [1] 0 0    
Cash and cash equivalents [2] 0 0    
Short-term investments [2] 0 0    
Other invested assets [2] 60,492 55,669    
Accrued investment income 360,225 347,173    
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) 3,909,506 3,786,987    
Policy loans 0 0    
Funds withheld at interest [1] 6,202,931 6,193,166    
Cash and cash equivalents [2] 0 0    
Short-term investments [2] 0 0    
Other invested assets [2] 167,947 131,904    
Accrued investment income 0 0    
Liabilities        
Interest-sensitive contract liabilities [1] 10,237,636 10,234,544    
Long-term Debt, Fair Value 2,964,610      
Debt, Long-term and Short-term, Combined Amount   3,186,173    
Collateral finance and securitization notes 732,353 $ 745,805    
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] 300,466      
Accrued investment income 0      
Liabilities        
Interest-sensitive contract liabilities [1] 0      
Long-term Debt, Fair Value 0      
Collateral finance and securitization notes $ 0      
[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.