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Fair Values of Financial Instruments (Reconciliation of Beginning and Ending Balances of Level 3 Assets and Liabilities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Coinsurance ceded, fixed index annuities embedded derivatives $ 8,850,608 $ 4,844,927
Fixed Index Annuities - Embedded Derivatives    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Coinsurance ceded, fixed index annuities embedded derivatives 1,245,000 655,300
Fixed Index Annuities - Embedded Derivatives | Fair Value, Measurements, Recurring    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 7,938,281 9,624,395
Premiums less benefits 1,424,372 235,971
Change in fair value, net (876,803) (1,922,085)
Reserve release related to in-force ceded reinsurance (520,889) 0
Ending balance 7,964,961 7,938,281
Equity Securities | Fair Value, Measurements, Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 0 0
Transfers in 6,349 0
Ending balance 6,349 0
Real Estate Investments | Fair Value, Measurements, Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 0 0
Purchases and sales, net 335,767 0
Change in fair value 2,172 0
Ending balance $ 337,939 $ 0