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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Changes in Company's Investment in MSC (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in the investment in MSC
Investment in MSC, beginning of period	$ 110,183
Income tax recovery	1,390	$ 3,844	$ 2,770
Dividend distribution received	(340)	(8,877)	(10,385)
Investment in MSC, end of period	108,326	110,183
MSC
Change in the investment in MSC
Investment in MSC, beginning of period	110,183	127,814
Attributable net income (loss) from MSC	2,745	(2,097)
Amortization of fair value increments	5,390	9,448
Income tax recovery	(1,128)	(2,791)
Dividend distribution received	(340)	(8,877)
Investment in MSC, end of period	$ 108,326	$ 110,183	$ 127,814

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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

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Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities.

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