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ACQUISITIONS - Revenue and income from operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gold and silver sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 67,465 | $ 60,388 | $ 72,956
Net (loss) income | $ 2,169 | $ (8,072) | $ (1,712) | $ (3,018) | $ (4,491) | $ 4,208 | $ 8,353 | $ 12,985 | $ (14,988) | $ 2,633 | $ (14,116) | $ 6,021 | (10,634) | $ 21,055 | $ (20,450)
Black Fox |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gold and silver sales |  |  |  |  |  |  |  |  |  |  |  |  | 11,620,000 |  |
Net (loss) income |  |  |  |  |  |  |  |  |  |  |  |  | $ 757,000 |  |

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