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INCOME AND MINING TAXES - Deferred Income Tax Recovery (Expense) and Net Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred income tax recovery (expense)
United States	$ 817	$ 2,420	$ 2,185
Foreign	573	1,424	585
Deferred tax benefit	1,390	3,844	2,770
Net income (loss) before tax:
United States	(127,524)	(22,319)	(27,001)
Foreign	(26,191)	(41,272)	(20,639)
Loss before income and mining taxes	$ (153,715)	$ (63,591)	$ (47,640)

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Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

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