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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	Jun. 30, 2021	Dec. 31, 2020
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	$ 74,941	$ 53,497
Total assets	520,604	499,936
Current liabilities	(44,985)	(45,554)
Total liabilities	(132,632)	$ (134,608)
Balance excluding FV increments | MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	84,938
Total assets	177,194
Current liabilities	(44,327)
Total liabilities	(74,196)
Adjustments | MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	437
Total assets	101,013
Total liabilities	(3,331)
Balance including FV increments | MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	85,375
Total assets	278,207
Current liabilities	(44,327)
Total liabilities	$ (77,527)

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