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ACQUISITIONS - Unaudited Pro Forma Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Unaudited Combined Pro Forma Results of Operations    
Gold and silver sales $ 131,072 $ 131,983
Net (loss) Income $ (1,093) $ 17,462
Pro forma net (loss) income per share Basic $ 0.00 $ 0.06
Pro forma net (loss) income per share Diluted $ 0.00 $ 0.06