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Derivative Instruments - Gain on Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gain (loss) on Kinross calls	$ 24	$ (1)
Gain on 5,000,000 Vendetta Warrants	148
Gain on derivative instruments	$ 172	$ (1)

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