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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Assets and Liabilities Associated with MSC (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	$ 57,546	$ 91,978
Total assets	506,180	631,223
Current liabilities	(35,983)	(48,795)
Total liabilities	(125,379)	$ (131,744)
Balance excluding FV increments | MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	95,364
Total assets	190,746
Current liabilities	(44,761)
Total liabilities	(75,190)
Adjustments | MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	854
Total assets	110,885
Total liabilities	(4,478)
Balance including FV increments | MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	96,218
Total assets	301,631
Current liabilities	(44,761)
Total liabilities	$ (79,668)

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