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GOODWILL IMPAIRMENT (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
GOODWILL IMPAIRMENT
Goodwill	$ 4,400		$ 4,373	$ 4,373	$ 136,400
Impairments of goodwill		$ 132,026
Hamilton mining complex
GOODWILL IMPAIRMENT
Goodwill					$ 132,000
Impairments of goodwill	$ 132,000

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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