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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		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Revenue from gold and silver sales	$ 27,395	$ 32,691	$ 77,086	$ 84,657
Production costs applicable to sales	(23,526)	(23,584)	(74,267)	(59,432)
Depreciation and depletion	(4,570)	(7,488)	(16,080)	(17,501)
Gross Profit	(701)	1,619	(13,261)	7,724
Net income (loss) before tax	(9,930)	(13,657)	(130,059)	(37,190)
Net loss	(9,778)	(11,465)	(128,783)	(34,615)
Revenue	27,395	32,691	77,086	84,657
Income tax recovery	152	2,192	1,276	2,575
Net loss			(128,783)	(34,617)
(Loss) from investment in MSC, net of amortization	$ 2,582	(328)	$ (1,139)	(6,775)
Subsidiary (as a percent)			100.00%
Ownership interest (as a percent)	49.00%		49.00%
Shutdown Costs			$ 1,968
Cost of Sales And Other Expenses
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Shutdown Costs			7,200
MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Revenue from gold and silver sales	$ 70,195	74,530	154,666	189,348
Production costs applicable to sales	(41,512)	(43,345)	(100,230)	(119,392)
Depreciation and depletion	(7,107)	(18,158)	(22,084)	(50,083)
Gross Profit	21,576	13,027	32,352	19,873
Exploration	(2,814)	(1,482)	(7,855)	(7,373)
Other expenses	(6,509)	(5,394)	(17,651)	(8,926)
Net income (loss) before tax	12,253	6,151	6,846	3,574
Current and deferred tax expense	(4,922)	(4,512)	(2,989)	(8,350)
Net loss	7,331	1,639	3,857	(4,776)
Revenue	70,195	74,530	154,666	189,348
Net income (loss)			1,890		$ (2,097)
Amortization of fair value increments			(3,891)		(9,448)
Income tax recovery			862		$ 2,791
(Loss) from investment in MSC, net of amortization	2,582	(328)	(1,139)	(6,775)
MSC | Equity Method Investment
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Net income (loss)	3,592	803	1,890	(2,340)
Amortization of fair value increments	(1,255)	(2,551)	(3,891)	(6,922)
Income tax recovery	$ 245	$ 1,420	$ 862	$ 2,487
Ownership interest (as a percent)	49.00%		49.00%

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