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Investments - Summary of Proceeds and Gains (Losses) Realized on Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Debt Securities, Available-for-sale [Line Items]        
Proceeds received, Fixed maturity securities $ 100,129 $ 118,818 $ 190,023 $ 229,690
Proceeds received, Equity securities 3,735 11,507 5,783 16,996
Fixed maturity securities        
Debt Securities, Available-for-sale [Line Items]        
Gross gains realized 2,352 4,080 4,022 6,569
Gross losses realized (1,584) (496) (1,637) (1,377)
Equity securities        
Debt Securities, Available-for-sale [Line Items]        
Gross gains realized 977 1,702 1,593 2,750
Gross losses realized $ (147) $ (236) $ (181) $ (428)