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Investments - Summary of Proceeds and Gains (Losses) Realized on Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Debt Securities, Available-for-sale [Line Items]        
Proceeds received, Fixed maturity securities $ 170,223 $ 85,841 $ 360,246 $ 315,531
Proceeds received, Equity securities 2,710 3,514 8,493 20,510
Fixed maturity securities        
Debt Securities, Available-for-sale [Line Items]        
Gross gains realized 3,980 2,293 8,002 8,862
Gross losses realized (5,893) (181) (7,530) (1,558)
Equity securities        
Debt Securities, Available-for-sale [Line Items]        
Gross gains realized 885 477 2,478 3,227
Gross losses realized $ (321) $ (293) $ (502) $ (721)