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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
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance $ 9,624,395 $ 8,165,405  
Premiums less benefits 112,158 58,008  
Change in fair value, net (1,285,071) 652,642  
Ending balance 8,451,482 $ 8,876,055  
Coinsurance ceded, fixed index annuities embedded derivatives 4,933,992   $ 5,115,013
Fixed Index Annuities - Embedded Derivatives      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Coinsurance ceded, fixed index annuities embedded derivatives $ 550,300   $ 644,600