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Investments, Unrealized Gains (Losses) Related to Equity Securities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Investments [Abstract]    
Net gains (losses) recognized during the period on equity securities $ 7,602 $ (4,419)
Less: Net gains (losses) recognized during the period on equity securities sold during the period 1,113 0
Net unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date $ 6,489 $ (4,419)