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FAIR VALUE OF FINANCIAL INSTRUMENTS - Determination of Fair Values Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
primary_source
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
input_method
Dec. 31, 2020
USD ($)
quote
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Determination of fair values              
Number of primary sources of information used for determining fair value | primary_source 1            
Total number of primary sources of information available for determining fair value 3     3      
Minimum percentage of the Company's fixed maturity securities priced by third party pricing services   92.80%          
Number of independent non-binding broker quotes obtained per security | quote         2    
Minimum percentage of underlying collateral guaranteed by third party   97.00%          
Percentage of derivatives excluding embedded derivatives that were priced using exchange prices or independent broker quotations   81.70%          
Other long-term investments $ 1,559,405 $ 1,559,405 $ 1,559,405 $ 1,559,405 $ 1,559,405 $ 995,493  
Golden Gate, Captive Merger              
Determination of fair values              
Gains recognized from merger agreements     23,500        
Level 3              
Determination of fair values              
Annuity account balances 1,810,800 1,810,800 1,810,800 1,810,800 1,810,800 1,087,700 $ 514,246
Asset-Backed Securities | Level 2              
Determination of fair values              
Fair value, assets 10,800,000 10,800,000 10,800,000 10,800,000 10,800,000    
Asset-Backed Securities | Level 3              
Determination of fair values              
Fair value, assets 538,500 538,500 538,500 538,500 538,500    
Other asset-backed securities | Level 3              
Determination of fair values              
Fair value, assets 434,676 434,676 434,676 434,676 434,676 421,219  
Other asset-backed securities | Level 3 | Available-for-sale securities              
Determination of fair values              
Fair value, assets 467,100 467,100 467,100 467,100 467,100    
Other asset-backed securities | Level 3 | Trading securities              
Determination of fair values              
Fair value, assets 71,400 71,400 71,400 71,400 71,400    
Equity securities | Level 2 and Level 3              
Determination of fair values              
Fair value, assets 101,200 101,200 101,200 101,200 101,200    
Federal home loan bank stock 89,900 $ 89,900 89,900 89,900 89,900    
Embedded derivative - GLWB | Minimum              
Determination of fair values              
Mortality rate   88.00%          
Embedded derivative - GLWB | Maximum              
Determination of fair values              
Mortality rate   100.00%          
Funds withheld derivative | Level 2              
Determination of fair values              
Fair value, derivative liability 66,300 $ 66,300 66,300 66,300 66,300    
Corporate securities | Level 2              
Determination of fair values              
Fair value, assets 58,400,000 58,400,000 58,400,000 58,400,000 58,400,000    
Corporate securities | Level 3              
Determination of fair values              
Fair value, assets 1,431,818 1,431,818 1,431,818 1,431,818 1,431,818 1,373,714  
Corporate Bonds And Securities | Level 3              
Determination of fair values              
Fair value, assets 1,400,000 $ 1,400,000 1,400,000 1,400,000 1,400,000    
Actuarial cash flow model | Embedded derivative—FIA | Level 3 | Minimum              
Determination of fair values              
Mortality rate   88.00%          
Actuarial cash flow model | Embedded derivative—FIA | Level 3 | Maximum              
Determination of fair values              
Mortality rate   100.00%          
Actuarial cash flow model | Embedded derivative - IUL | Level 3 | Minimum              
Determination of fair values              
Mortality rate   36.00%          
Actuarial cash flow model | Embedded derivative - IUL | Level 3 | Maximum              
Determination of fair values              
Mortality rate   161.00%          
Variable annuity | Level 3              
Determination of fair values              
Annuity account balances $ 66,973 $ 66,973 $ 66,973 $ 66,973 $ 66,973 $ 69,728 $ 76,119