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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning balance $ 9,418,485 $ 9,281,117 $ 9,624,395 $ 8,165,405  
Premiums less benefits 78,244 74,979 243,421 333,459  
Change in fair value, net (2,021,513) 24,998 (2,392,600) 882,230  
Ending balance 7,475,216 $ 9,381,094 7,475,216 $ 9,381,094  
Coinsurance ceded, fixed index annuities embedded derivatives 4,886,705   4,886,705   $ 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 $ 611,200   $ 611,200   $ 644,600