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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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-Publisher FASB
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Aggregate revenue from the sale of minerals and related products, and from rendering services such as exploration, development, mining, processing and providing mining support activities.

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