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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, 2018 | Dec. 31, 2017
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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |
Current assets | $ 79,625 | $ 86,864
Total assets | 588,147 | 592,129
Current liabilities | 40,332 | 37,639
Total liabilities | 73,528 | $ 70,856
MSC |  |
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |
Current assets | 89,700 |
Total assets | 387,600 |
Current liabilities | 38,400 |
Total liabilities | 91,700 |
MSC | Current Period Values Excluding Fair Value Increments And Impairment Charge |  |
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |
Current assets | 89,100 |
Total assets | 233,600 |
Current liabilities | 38,400 |
Total liabilities | $ 66,600 |

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