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Fair Values of Financial Instruments (Reconciliation of Beginning and Ending Balances of Level 3 Liabilities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 8,165,405 $ 8,790,427
Premiums less benefits 896,688 1,542,606
Change in fair value, net 562,302 (2,167,628)
Ending balance 9,624,395 8,165,405
Coinsurance ceded, fixed index annuities embedded derivatives 5,115,013 4,954,068
Fixed Index Annuities - Embedded Derivatives    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Coinsurance ceded, fixed index annuities embedded derivatives $ 644,600 $ 538,800