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OPERATING SEGMENT REPORTING - Geographic information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Operating Segment Reporting
Revenue from gold and silver sales	$ 27,395	$ 32,691	$ 77,086	$ 84,657
Long-lived Assets	447,763		447,763		$ 539,150
Investment in MSC	108,762		108,762		110,183
Lease assets	900		900
MSC
Operating Segment Reporting
Revenue from gold and silver sales	70,195	74,530	154,666	189,348
Investment in MSC	108,762		108,762		110,183	$ 127,814
USA
Operating Segment Reporting
Revenue from gold and silver sales	13,042	16,577	38,129	28,941
Long-lived Assets	49,299		49,299		135,854
Canada
Operating Segment Reporting
Revenue from gold and silver sales	10,352	11,147	27,257	36,139
Long-lived Assets	78,161		78,161		77,147
Mexico
Operating Segment Reporting
Revenue from gold and silver sales	4,001	$ 4,967	11,700	$ 19,577
Long-lived Assets	20,051		20,051		23,551
Argentina
Operating Segment Reporting
Long-lived Assets	300,252		300,252		302,598
Argentina | MSC
Operating Segment Reporting
Investment in MSC	$ 108,800		$ 108,800		$ 110,200

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Amount of investment in equity method investee and investment in and advance to affiliate.

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