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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Summary of Operating Results from MSC (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Revenue from gold and silver sales									$ 104,789	$ 117,019	$ 128,175
Depreciation and depletion									(22,910)	(24,753)	(15,079)
Gross Profit	$ (13,687)	$ (701)	$ (8,875)	$ (3,685)	$ 1,261	$ 1,619	$ 4,677	$ 1,429	(26,948)	8,986	32,082
Net income (loss) before tax									(153,715)	(63,591)	(47,640)
Net (loss) income	$ (23,542)	$ (9,778)	$ (19,814)	$ (99,191)	$ (25,132)	$ (11,465)	$ (13,014)	$ (10,136)	(152,325)	(59,747)	(44,870)
Income tax recovery									1,390	3,844	2,770
(Loss) from investment in MSC, net of amortization									$ (1,517)	(8,754)	(11,865)
Subsidiary (as a percent)									100.00%
Ownership interest (as a percent)	49.00%								49.00%
Shutdown Costs									$ 1,968
Equity Method Investment
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Net income (loss)									2,745	(2,097)	(10,065)
Amortization of fair value increments									(5,390)	(9,448)	(9,730)
Income tax recovery									1,128	2,791	7,930
(Loss) from investment in MSC, net of amortization									(1,517)	(8,754)	(11,865)
MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Net income (loss)									2,745	(2,097)
Amortization of fair value increments									5,390	9,448
Income tax recovery									(1,128)	(2,791)
Shutdown Costs									11,400
MSC | Equity Method Investment
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Revenue from gold and silver sales									219,020	263,887	213,096
Production costs applicable to sales									(138,182)	(159,915)	(151,779)
Depreciation and depletion									(29,809)	(69,995)	(52,200)
Gross Profit									51,029	33,977	9,117
Exploration									(10,446)	(10,635)	(5,884)
Other expenses									(30,515)	(13,065)	(12,840)
Net income (loss) before tax									10,068	10,277	(9,607)
Current and deferred tax expense									(4,466)	(14,556)	(10,934)
Net (loss) income									$ 5,602	$ (4,279)	$ (20,541)
Ownership interest (as a percent)	49.00%								49.00%

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