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Reinsurance and Policy Provisions (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Basis_Points
Sep. 30, 2021
USD ($)
Basis_Points
yearOfAgreement
Oct. 08, 2021
USD ($)
Dec. 31, 2020
USD ($)
Oct. 18, 2020
Ceded Credit Risk [Line Items]          
Other liabilities $ 5,862,955 $ 5,862,955   $ 1,668,025  
Coinsurance deposits (net of allowance for credit losses of $2,697 as of 2021 and $1,888 as of 2020) $ 8,733,096 $ 8,733,096   $ 4,844,927  
Third party ownership interest in Company's common stock 9.50% 9.50%      
North End Re, Reinsurance Agreement, In Force as of July 1, 2021          
Ceded Credit Risk [Line Items]          
Reinsurance liabilities, amount ceded $ 4,327,100 $ 4,327,100      
Reinsurance agreement, modified coinsurance basis, percentage   70.00%      
Reinsurance agreement, coinsurance basis, percentage   30.00%      
Annual ceding commission, basis points | Basis_Points 49 49      
Annual asset liability management fee, basis points | Basis_Points 30 30      
Contractually guaranteed fees, duration   6 years      
Fees contingent on certain performance obligations, agreement year | yearOfAgreement   7      
Ceding commission, initial net present value $ 114,100        
North End Re, Reinsurance Agreement, July 1, 2021 Going Forward          
Ceded Credit Risk [Line Items]          
Coinsurance on certain annuities, percentage   75.00%      
Reinsurance agreement, modified coinsurance basis, percentage   70.00%      
Reinsurance agreement, coinsurance basis, percentage   30.00%      
Annual ceding commission, basis points | Basis_Points 140 140      
Annual asset liability management fee, basis points | Basis_Points 30 30      
Contractually guaranteed fees, duration   6 years      
Fees contingent on certain performance obligations, agreement year | yearOfAgreement   7      
Ceding commission, initial net present value $ 12,900        
North End Re          
Ceded Credit Risk [Line Items]          
Other liabilities 292,900 $ 292,900      
Coinsurance deposits (net of allowance for credit losses of $2,697 as of 2021 and $1,888 as of 2020) 4,500,000 4,500,000      
Reinsurance payable 4,200,000 4,200,000      
Reinsurance payable, quarterly settlement of policyholder activity and call options 200,000 200,000      
North End Re, Reinsurance Agreement, Modified Coinsurance Basis | North End Re          
Ceded Credit Risk [Line Items]          
Reinsurance payable 2,900,000 2,900,000      
North End Re, Reinsurance Agreement, Coinsurance Basis | North End Re          
Ceded Credit Risk [Line Items]          
Reinsurance payable $ 1,100,000 $ 1,100,000      
Maximum          
Ceded Credit Risk [Line Items]          
Expected future third party ownership interest in Company's common stock         19.90%
Minimum          
Ceded Credit Risk [Line Items]          
Expected future third party ownership interest in Company's common stock         15.00%
Subsequent Events | North End Re, Reinsurance Agreement, Modified Coinsurance Basis | North End Re, Reinsurance Agreement, In Force as of July 1, 2021          
Ceded Credit Risk [Line Items]          
Cash transferred at close of reinsurance agreement     $ 2,645,500    
Subsequent Events | North End Re, Reinsurance Agreement, Coinsurance Basis | North End Re, Reinsurance Agreement, In Force as of July 1, 2021          
Ceded Credit Risk [Line Items]          
Cash transferred at close of reinsurance agreement     $ 1,133,800