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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, 2019	Dec. 31, 2018
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	$ 56,886	$ 59,376
Total assets	607,211	616,941
Current liabilities	(40,429)	(36,012)
Total liabilities	(129,503)	$ (130,995)
Balance excluding FV increments | MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	72,664
Total assets	185,522
Current liabilities	(45,881)
Total liabilities	(74,128)
Adjustments | MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	113
Total assets	124,112
Current liabilities	10,114
Total liabilities	3,257
Balance including FV increments | MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	72,777
Total assets	309,634
Current liabilities	(35,767)
Total liabilities	$ (70,871)

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