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Derivative Instruments - Gain on Derivative Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	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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