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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, 2019
Mar. 31, 2018
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 58,008 549,153  
Change in fair value, net 652,642 (1,106,023)  
Ending balance 8,876,055 $ 8,233,557  
Coinsurance ceded, fixed index annuities embedded derivatives 4,995,744   $ 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 $ 590,800   $ 538,800