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Derivative Instruments - Gain Loss on Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
(Loss) gain on Kinross calls $ 72 $ 1 $ (11) $ 84
Gain on Vendetta Warrants $ 91 $ 306