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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 11 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 24, 2012
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |  |  |  |
Impairment |  |  | $ 95,878 |  |
Income on investment in MSC, net of amortization |  |  | 846 | 20,835 |
MSC |  |  |  |  |
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |  |  |  |
Interest acquired (as a percent) |  | 49.00% |  | 49.00% |
Impairment | 95,900 |  | 95,878 |  |
Sales percentage |  | 100.00% | 100.00% |  |
Sales |  | 290,848 | 240,723 |  |
Production costs applicable to sales |  | (155,915) | (190,281) |  |
Income from operations before extraordinary items |  | 51,634 | 4,338 |  |
Net income |  | 51,634 | 4,338 |  |
Ownership interest (as a percent) |  |  | 49.00% |  | 49.00%
Net income on investment in MSC |  | 25,301 | 2,126 | 25,301 |
Amortization of fair value increments |  | (4,466) | (1,280) | (4,466) |
Income on investment in MSC, net of amortization |  | $ 20,835 | $ 846 |  |

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