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INVESTMENTS - (Net Unrealized Gains (Losses) Still Held (Details) - Equity Securities [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Net realized and unrealized gains (losses) $ 4,919 $ (577)
Net realized and unrealized gains (losses) on securities sold 672 732
Net unrealized gains (losses) still held as of the end-of-period $ 4,247 $ (1,309)