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Investments - Summary of Proceeds and Gains (Losses) Realized on Securities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fixed maturity securities    
Proceeds received $ 98,158 $ 59,724
Gross gains realized 4,779 542
Gross losses realized (268) (105)
Equity Securities, FV-NI, Realized Gain (Loss) [Abstract]    
Proceeds received 1,457 15,489
Gross gains realized 319 4,745
Gross losses realized $ (556) $ (344)