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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
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Coinsurance ceded, fixed index annuities embedded derivatives $ 8,713,069   $ 8,850,608
Fair Value, Measurements, Recurring | Equity Securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance 6,349 $ 0  
Transfers in 0 0  
Included in net income (2,482) 0  
Included in other comprehensive income (loss) 0 0  
Ending balance 3,867 0  
Fair Value, Measurements, Recurring | Real Estate Investments      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance 337,939 0  
Purchases and sales, net 168,088 0  
Included in net income 4,161 0  
Ending balance 510,188 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 1,048,700   $ 1,245,000
Fixed Index Annuities - Embedded Derivatives | Fair Value, Measurements, Recurring      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance 7,964,961 7,938,281  
Premiums less benefits 114,077 119,791  
Change in fair value, net (1,308,123) (377,121)  
Ending balance $ 6,770,915 $ 7,680,951