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Summary of Notional and Fair Value Position of Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Equity Options    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Assets $ 338,470 $ 237,250
Notional Liabilities 324,047 234,375
Gross Fair Value, Assets 5,099 39,397
Gross Fair Value, Liabilities (1,584) (18,352)
Future    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Liabilities 9,934  
Gross Fair Value, Liabilities (539)  
Contractholder funds | Guaranteed accumulation benefits    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Liabilities [1] 40,469 53,517
Gross Fair Value, Liabilities [1] (5,203) (4,557)
Contractholder funds | Guaranteed withdrawal benefits    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Liabilities [1] 8,070 9,939
Gross Fair Value, Liabilities [1] (113) (113)
Contractholder funds | Equity-indexed annuity contracts    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Liabilities [2] 924,733 1,095,253
Gross Fair Value, Liabilities [2] (44,947) (57,531)
Contractholder funds | Equity-indexed life contracts    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Liabilities 588,299 531,800
Gross Fair Value, Liabilities $ (8,624) $ (29,911)
[1] These amounts are fully ceded in accordance with the Company's reinsurance agreements. The corresponding receivables have been excluded from the table above.
[2] Notional amount represents account value of equity indexed contracts