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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 | Mar. 31, 2019 | Dec. 31, 2018
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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |
Current assets | $ 65,660 | $ 59,376
Total assets | 628,976 | 616,941
Current liabilities | 32,982 | 36,012
Total liabilities | 130,779 | $ 130,995
MSC |  |
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |
Current assets | 64,700 |
Total assets | 324,900 |
Current liabilities | 36,300 |
Total liabilities | 72,900 |
MSC | Current Period Values Excluding Fair Value Increments And Impairment Charge |  |
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |
Current assets | 64,000 |
Total assets | 190,100 |
Current liabilities | 36,300 |
Total liabilities | $ 62,900 |

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