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Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Gain Loss on Derivative Instruments
(in thousands)

Three months ended

June 30,

Six months ended

June 30,

   2018  2017  2018  2017
  Gain on Kinross calls  $  -     $  14   $  -     $  38 
  Gain on Vendetta Warrants -    99  -    247 
  $  -    $113  $  -    $285