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Derivative Instruments - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Fixed indexed annuities term minimum 10 years  
Financial instrument, maximum exposure $ 250  
Other liabilities    
Derivatives, Fair Value [Line Items]    
Fair value of collateral $ 15,584 $ 8,824