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Investments, Unrealized Gains (Losses) Related to Equity Securities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Investments [Abstract]    
Net losses recognized during the period on equity securities $ (4,419) $ 0
Less: Net gains (losses) recognized during the period on equity securities sold during the period 0 0
Unrealized losses recognized during the reporting period on equity securities still held at the reporting date $ (4,419) $ 0