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Investments, Unrealized Gains (Losses) Related to Equity Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Investments [Abstract]        
Net gains recognized during the period on equity securities $ 1,355 $ 0 $ 1,025 $ 0
Less: Net losses recognized during the period on equity securities sold during the period (272) 0 (272) 0
Net unrealized gains recognized during the reporting period on equity securities still held at the reporting date $ 1,083 $ 0 $ 753 $ 0