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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
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Assets        
Mortgage loans on real estate (net of valuation allowances) $ 4,779,074 $ 4,400,533    
Policy loans 1,320,050 1,357,624    
Funds withheld at interest 5,976,301 6,083,388    
Cash and cash equivalents 1,730,489 1,303,524 $ 1,204,590 $ 1,200,718
Short-term investments 229,928 93,304    
Other invested assets 1,706,979 1,505,332    
Accrued investment income 455,296 392,721    
Liabilities        
Interest-sensitive contract liabilities 16,751,379 16,227,642    
Long-term debt 2,787,975 2,788,365    
Collateral finance and securitization notes 710,792 783,938    
Reported Value Measurement [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) [1] 4,779,074 4,400,533    
Policy loans [1] 1,320,050 1,357,624    
Funds withheld at interest [1] 5,833,925 5,955,092    
Cash and cash equivalents [1] 1,073,209 946,736    
Short-term investments [1] 43,877 42,558    
Other invested assets [1] 842,626 651,792    
Accrued investment income [1] 455,296 392,721    
Liabilities        
Interest-sensitive contract liabilities [1] 13,319,348 12,683,872    
Long-term debt [1] 2,787,975      
Debt, Long-term and Short-term, Combined Amount [1]   2,788,365    
Collateral finance and securitization notes [1] 710,792 783,938    
Estimate of Fair Value Measurement [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) 4,652,481 4,477,654    
Policy loans 1,320,050 1,357,624    
Funds withheld at interest 6,040,671 6,275,623    
Cash and cash equivalents 1,073,209 946,736    
Short-term investments 43,877 42,558    
Other invested assets 839,280 679,377    
Accrued investment income 455,296 392,721    
Liabilities        
Interest-sensitive contract liabilities 13,113,427 [1] 12,917,243    
Long-term Debt, Fair Value 2,850,344      
Debt, Long-term and Short-term, Combined Amount   2,959,912    
Collateral finance and securitization notes 652,380 722,145    
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 0 0    
Cash and cash equivalents 1,073,209 946,736    
Short-term investments 43,877 42,558    
Other invested assets 5,618 28,540    
Accrued investment income 0 0    
Liabilities        
Interest-sensitive contract liabilities 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 1,320,050 1,357,624    
Funds withheld at interest 0 0    
Cash and cash equivalents 0 0    
Short-term investments 0 0    
Other invested assets 71,401 67,778    
Accrued investment income 455,296 392,721    
Liabilities        
Interest-sensitive contract liabilities 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) 4,652,481 4,477,654    
Policy loans 0 0    
Funds withheld at interest 6,040,671 6,275,623    
Cash and cash equivalents 0 0    
Short-term investments 0 0    
Other invested assets 382,284 247,934    
Accrued investment income 0 0    
Liabilities        
Interest-sensitive contract liabilities 13,113,427 12,917,243    
Long-term Debt, Fair Value 2,850,344      
Debt, Long-term and Short-term, Combined Amount   2,959,912    
Collateral finance and securitization notes 652,380 722,145    
Estimate of Fair Value Measurement [Member] | Fair Value Measured at Net Asset Value Per Share [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) 0 0    
Policy loans 0 0    
Funds withheld at interest 0 0    
Cash and cash equivalents 0 0    
Short-term investments 0 0    
Other invested assets 379,977 335,125    
Accrued investment income 0 0    
Liabilities        
Interest-sensitive contract liabilities 0 0    
Long-term Debt, Fair Value 0      
Debt, Long-term and Short-term, Combined Amount   0    
Collateral finance and securitization notes $ 0 $ 0    
[1] aid.September 30, 2018: Carrying Value (1) Estimated Fair Value Fair Value Measurement Using:Level 1 Level 2 Level 3 NAVAssets: Mortgage loans on real estate $4,779,074 $4,652,481 $— $— $4,652,481 $—Policy loans 1,320,050 1,320,050 — 1,320,050 — —Funds withheld at interest 5,833,925 6,040,671 — — 6,040,671 —Cash and cash equivalents 1,073,209 1,073,209 1,073,209 — — —Short-term investments 43,877 43,877 43,877 — — —Other invested assets 842,626 839,280 5,618 71,401 382,284 379,977Accrued investment income 455,296 455,296 — 455,296 — —Liabilities: Interest-sensitive contract liabilities $13,319,348 $13,113,427 $— $— $13,113,427 $—Long-term debt 2,787,975 2,850,344 — — 2,850,344 —Collateral finance and securitization notes 710,792 652,380 — — 652,380 — December 31, 2017: Carrying Value (1) Estimated Fair Value Fair Value Measurement Using:Level 1 Level 2 Level 3 NAVAssets: Mortgage loans on real estate $4,400,533 $4,477,654 $— $— $4,477,654 $—Policy loans 1,357,624 1,357,624 — 1,357,624 — —Funds withheld at interest 5,955,092 6,275,623 — — 6,275,623 —Cash and cash equivalents 946,736 946,736 946,736 — — —Short-term investments 42,558 42,558 42,558 — — —Other invested assets 651,792 679,377 28,540 67,778 247,934 335,125Accrued investment income 392,721 392,721 — 392,721 — —Liabilities: Interest-sensitive contract liabilities $12,683,872 $12,917,243 $— $— $12,917,243 $—Long-term debt 2,788,365 2,959,912 — — 2,959,912 —Collateral finance and securitization notes 783,938 722,145 — — 722,145 — (1)Carrying values presented herein may differ from those in the Company’s condensed consolidated balance sheets because certain items within the respective financial statement captions may be measured at fair value on a recurring basis.