INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Assets and Liabilities Associated with MSC (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	$ 95,295	$ 85,026
Total assets	535,773	525,341
Current liabilities	(59,105)	(52,399)
Total liabilities	(156,393)	$ (135,400)
Balance excluding FV increments | Minera Santa Cruz S.A. [Member]
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	85,336
Total assets	176,818
Current liabilities	(51,574)
Total liabilities	(79,865)
Adjustments | Minera Santa Cruz S.A. [Member]
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	889
Total assets	88,710
Total liabilities	(2,326)
Balance including FV increments | Minera Santa Cruz S.A. [Member]
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	86,225
Total assets	265,528
Current liabilities	(51,574)
Total liabilities	$ (82,191)