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

Three months ended

March 31,

   2018  2017
  Gain (loss) on Kinross calls  $  -     $  24 
  Gain on Vendetta Warrants -    148 
  $  -    $172