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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Coinsurance ceded, fixed index annuities embedded derivatives $ 4,441,950   $ 4,441,950   $ 4,844,927
Real Estate Investments | Fair Value, Measurements, Recurring          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning balance 0 $ 0 0 $ 0  
Purchases and sales, net 258,237 0 258,237 0  
Change in fair value 0 0 0 0  
Ending balance 258,237 0 258,237 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 668,500   668,500   $ 655,300
Fixed Index Annuities - Embedded Derivatives | Fair Value, Measurements, Recurring          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 7,680,951 8,451,482 7,938,281 9,624,395  
Premiums less benefits 577,729 53,019 697,520 165,177  
Change in fair value, net 126,084 913,984 (251,037) (371,087)  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ 8,384,764 $ 9,418,485 $ 8,384,764 $ 9,418,485