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Derivative Instruments - Gain Loss on Derivative Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Gain on Kinross calls $ 14 $ 38
Gain on Vendetta Warrants 99 247
Gain on Derivative Instruments $ 113 $ 285