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Derivative Instruments (Tables)
12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Gain on Derivative Instruments
(in thousands)

Year ended

December 31,

   2018  2017
  Gain on Kinross calls  $  -   $  55 
  Gain on Vendetta Warrants 216 
  $  -  $271