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Derivative Instruments - Gain Loss on Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gain on Kinross calls		$ 13		$ 52
Gain on Vendetta Warrants		(31)		215
Gain on Derivative Instruments		$ (18)		$ 267

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