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Derivative Instruments (Tables)
3 Months Ended
Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Gain Loss on Derivative Instruments
(in thousands)

Three months ended

March 31,

  2015 2014
Shares of Kinross 180  130 
  Proceeds from sale of call $ 84  $ 36 
  Gain on derivative instrument  82  29 
    Ending liability balance $ 2  $   7