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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE (Details2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 11 Months Ended
--- | --- | ---
Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2012
Change in the investment in MSC |  |  |  |
Investment in MSC, end of period |  |  |  | $ 273,948
MSC |  |  |  |
Change in the investment in MSC |  |  |  |
Fair value of investment in MSC from acquisition of Minera Andes |  |  |  | 262,883
Income from equity investment |  |  |  | 25,301
Amortization of fair value increments | (1,668) | (916) | (953) | (4,466)
Dividend distribution |  |  |  | (9,770)
Investment in MSC, end of period |  |  |  | $ 273,948

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