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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning balance $ 9,281,117 $ 8,351,151 $ 8,165,405 $ 8,790,427  
Premiums less benefits 74,979 399,234 333,459 1,354,881  
Change in fair value, net 24,998 196,808 882,230 (1,198,115)  
Ending balance 9,381,094 $ 8,947,193 9,381,094 $ 8,947,193  
Coinsurance ceded, fixed index annuities embedded derivatives 5,072,015   5,072,015   $ 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 $ 614,600   $ 614,600   $ 538,800