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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 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Coinsurance ceded, fixed index annuities embedded derivatives $ 8,848,418   $ 8,848,418   $ 8,850,608
Other Investments | Fair Value, Measurements, Recurring          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning balance 0 $ 0 6,349 $ 0  
Transfers in 0 6,349 0 6,349  
Transfers out 0 0 (3,867) 0  
Included in net income 0 0 (2,482) 0  
Included in other comprehensive income (loss) 0 0 0 0  
Ending balance 0 6,349 0 6,349  
Real Estate Investments | Fair Value, Measurements, Recurring          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning balance 672,475 258,237 337,939 0  
Purchases and sales, net 250,062 1,025 553,628 259,262  
Included in net income (24,864) 0 6,106 0  
Ending balance 897,673 259,262 897,673 259,262  
Corporate Securities | Fair Value, Measurements, Recurring          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning balance 77,726 0 0 0  
Transfers in 241,878 0 319,604 0  
Included in net income 0 0 0 0  
Included in other comprehensive income (loss) (72) 0 (72) 0  
Ending balance 319,532 0 319,532 0  
Other Asset Backed Securities | Fair Value, Measurements, Recurring          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning balance 64,550 0 0 0  
Transfers in 37,151 0 101,701 0  
Included in net income 0 0 0 0  
Included in other comprehensive income (loss) (3,456) 0 (3,456) 0  
Ending balance 98,245 0 98,245 0  
Funds Withheld Liability - Embedded Derivative | Fair Value, Measurements, Recurring          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning balance 0 0 0 0  
Transfers in (520,458) 0 (520,458) 0  
Change in fair value, net 0 0 0 0  
Ending balance (520,458) 0 (520,458) 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 733,500   733,500   $ 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 5,836,312 8,384,764 7,964,961 7,938,281  
Premiums less benefits (92,242) 365,474 (28,759) 1,062,994  
Change in fair value, net (466,244) (681,509) (2,658,376) (932,546)  
Reserve release related to in-force ceded reinsurance (20,784) (520,889) (20,784) (520,889)  
Ending balance $ 5,257,042 $ 7,547,840 $ 5,257,042 $ 7,547,840