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Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Gain on Derivative Instruments
(in thousands)

Three months ended

June 30,

Six months ended

June 30,

  2017 2016 2017 2016
  (Loss) gain on Kinross calls $ 14  $ (82)  $ 38   $ (83)
  Gain on Vendetta Warrants 99  215  247  215 
Total $113  $133  $285  $132 
Fair Value Derivative Instruments
  Derivatives
    June 30, December 31,
(in thousands) Balance Sheet Location 2017 2016
 Vendetta warrants Other assets $673  $735 
 Kinross calls Other current liabilities $    7  $    2