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INVESTMENT IN MINERA SANTA CRUZ S.A. (''MSC'') - SAN JOSE MINE (Details 4) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Sep. 30, 2013 | Sep. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 MSC | Sep. 30, 2013 MSC | Dec. 31, 2013 MSC | Sep. 30, 2014 MSC | Jun. 30, 2014 MSC Current Period Values Excluding Fair Value Increments And Impairment Charge
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |  |  |  |  |  |  |
Current assets |  | $ 39,702 | $ 46,771 |  |  |  | $ 98,300 | $ 101,200
Total assets |  | 783,460 | 923,066 |  |  |  | 518,500 | 308,900
Current liabilities |  | 19,768 | 11,189 |  |  |  | 56,900 | 56,900
Total liabilities |  | 132,622 | 176,299 |  |  |  | 141,600 | 94,500
Impairment of investment in MSC | $ 95,878 |  |  | $ 95,900 | $ 95,900 | $ 95,878 |  |

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