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Marketable Equity Securities (Tables)
12 Months Ended
Dec. 31, 2019
Marketable Securities [Abstract]  
Marketable securities and adjustment to fair value
(in thousands)   Year ended December 31,  
    2019     2018  
  Marketable equity securities at cost   $ 1,879     $ 1,714  
  Cumulative unrealized (loss) gain on marketable equity securities     (840 )     (129 )
  Marketable equity securities at fair value   $ 1,039     $ 1,585