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Fair Values of Financial Instruments (Reconciliation of Beginning and Ending Balances of Level 3 Liabilities) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Coinsurance ceded, fixed index annuities embedded derivatives $ 8,733,096   $ 8,733,096   $ 4,844,927
Equity Securities | Fair Value, Measurements, Recurring          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning balance 0 $ 0 0 $ 0  
Transfers in 6,349 0 6,349 0  
Ending balance 6,349 0 6,349 0  
Real Estate Investments | Fair Value, Measurements, Recurring          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning balance 258,237 0 0 0  
Purchases and sales, net 1,025 0 259,262 0  
Change in fair value 0 0 0 0  
Ending balance 259,262 0 259,262 0  
Fixed Index Annuities - Embedded Derivatives          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Coinsurance ceded, fixed index annuities embedded derivatives 1,162,400   1,162,400   $ 655,300
Fixed Index Annuities - Embedded Derivatives | Fair Value, Measurements, Recurring          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning balance 8,384,764 9,418,485 7,938,281 9,624,395  
Premiums less benefits 365,474 78,244 1,062,994 243,421  
Change in fair value, net (681,509) (2,021,513) (932,546) (2,392,600)  
Reserve release related to in-force ceded reinsurance (520,889) 0 (520,889) 0  
Ending balance $ 7,547,840 $ 7,475,216 $ 7,547,840 $ 7,475,216