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Derivative Instruments - Gain on Derivative Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Gain on Kinross calls | $ 55 | $ 43
Gain on Vendetta Warrants | 216 | 629
Gain on derivative instruments | $ 271 | $ 672

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