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Derivative Instruments - Derivative Instruments Gain Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
(Loss) gain on Kinross calls $ (82) $ 1 $ (83) $ 83
Gain on Vendetta Warrants $ 215 $ 215