INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Assets and Liabilities Associated with MSC (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	$ 85,026	$ 53,497
Total assets	525,341	499,936
Current liabilities	(52,399)	(45,554)
Total liabilities	(135,400)	(134,608)
Balance excluding FV increments | Minera Santa Cruz S.A. [Member]
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	89,876	94,965
Total assets	180,302	186,438
Current liabilities	(51,244)	(40,396)
Total liabilities	(82,075)	(69,255)
Adjustments | Minera Santa Cruz S.A. [Member]
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	469	362
Total assets	89,975	107,821
Total liabilities	(2,577)	(3,936)
Balance including FV increments | Minera Santa Cruz S.A. [Member]
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	90,345	95,327
Total assets	270,277	294,259
Current liabilities	(51,244)	(40,396)
Total liabilities	$ (84,652)	$ (73,191)