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, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Revenue from gold and silver sales									$ 136,541	$ 104,789	$ 117,019
Depreciation and depletion									(23,798)	(22,910)	(24,753)
Gross Profit	$ (5,897)	$ 344	$ 4,059	$ (4,986)	$ (13,687)	$ (701)	$ (8,875)	$ (3,685)	(6,480)	(26,948)	8,986
Other expenses										(1,968)
Net income before tax									(64,199)	(153,715)	(63,591)
Net income (loss)					$ (23,542)	$ (9,778)	$ (19,814)	$ (99,191)	(56,712)	(152,325)	(59,747)
Income tax recovery									7,315	1,390	3,844
Loss from investment in MSC, net of amortization									$ (7,533)	(1,517)	(8,754)
Subsidiary (as a percent)									100.00%
Ownership interest (as a percent)	49.00%								49.00%
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Net income (loss)									$ 132	2,745	(2,097)
Amortization of fair value increments									(8,331)	(5,390)	(9,448)
Income tax recovery									666	1,128	2,791
Loss from investment in MSC, net of amortization									(7,533)	(1,517)	(8,754)
Minera Santa Cruz S.A. [Member]
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Net income (loss)									132	2,745
Amortization of fair value increments									8,331	5,390
Income tax recovery									(666)	(1,128)
Shutdown costs									19,300	11,400
Minera Santa Cruz S.A. [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Revenue from gold and silver sales									271,863	219,020	263,887
Production costs applicable to sales									(196,033)	(138,182)	(159,915)
Depreciation and depletion									(39,948)	(29,809)	(69,995)
Gross Profit									35,882	51,029	33,977
Exploration									(10,602)	(10,446)	(10,635)
Other expenses (1)									(17,077)	(30,515)	(13,065)
Net income before tax									8,203	10,068	10,277
Current and deferred tax expense									(7,934)	(4,466)	(14,556)
Net income (loss)									$ 269	$ 5,602	$ (4,279)
Ownership interest (as a percent)	49.00%								49.00%