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Investments, Summary of Realized Investment Gains (Losses) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Summary of realized investment gains (losses) [Abstract]    
Gains $ 3,224 $ 6,983
Losses (1,650) (1,829)
Realized investment gains (losses), net 1,574 5,154
Fixed Maturities [Member]    
Summary of realized investment gains (losses) [Abstract]    
Gains 2,003 884
Losses (1,650) (1,829)
Realized investment gains (losses), net 353 (945)
Proceeds from Sales of Available-for-sale [Abstract]    
Sales proceeds 117,530 30,078
Gross gains 2,003 884
Gross losses (1,650) (1,829)
Equity Securities [Member]    
Summary of realized investment gains (losses) [Abstract]    
Gains 1,221 272
Losses 0 0
Realized investment gains (losses), net 1,221 272
Other Investments [Member]    
Summary of realized investment gains (losses) [Abstract]    
Gains 0 5,827
Losses 0 0
Realized investment gains (losses), net $ 0 $ 5,827