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STOCKHOLDERS' EQUITY: (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 60 Months Ended | 90 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2015 | Mar. 31, 2015 | Feb. 28, 2015 | Jan. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2015
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | $ 1,900,686 |  | $ 1,900,686 | $ 1,900,686 |  |  |  |  |
Purchase of shares | $ 44,500 | $ 133,100 | $ 76,300 | 160,700 | $ 44,500 | 370,100 |  |  | $ 682,800 | $ 281,400 | $ 878,100 | $ 2,256,900
Balance at the end of the period |  |  |  |  | 2,312,401 |  | $ 2,312,401 | $ 1,290,600 | 1,900,686 |  |  | 2,312,401
Southern copper common shares | Directors' Stock Award Plan |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Plan, share distributions |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Plan, share distributions during the period |  |  |  |  |  |  | 13,200 | 12,000 |  |  |  |
Parent Company (Grupo Mexico) common shares | Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Plan, share distributions |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Plan, share distributions during the period |  |  |  |  |  |  | 200,000 | 700,000 |  |  |  |
TREASURY STOCK: | Southern copper common shares |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | 1,693,500 |  | 1,693,500 | $ 1,693,500 | $ 1,011,000 | 1,011,000 |  |  |
Purchase of shares |  |  |  |  |  |  | 414,600 | 65,500 |  |  |  |
Used for corporate purposes |  |  |  |  |  |  | (400) | (300) |  |  |  |
Balance at the end of the period |  |  |  |  | $ 2,107,700 |  | $ 2,107,700 | $ 1,076,200 | 1,693,500 | 1,011,000 |  | $ 2,107,700
Treasury stock balance at the end of the period (in shares) |  |  |  |  | 86,556,843 |  | 86,556,843 | 51,591,147 |  |  |  | 86,556,843
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | $ 207,200 |  | $ 207,200 | $ 207,200 | $ 205,600 | 205,600 |  |  |
Other activity, including dividend, interest and currency translation effect |  |  |  |  |  |  | (2,500) | 8,800 |  |  |  |
Balance at the end of the period |  |  |  |  | $ 204,700 |  | $ 204,700 | $ 214,400 | $ 207,200 | $ 205,600 |  | $ 204,700
Treasury stock balance at the end of the period (in shares) |  |  |  |  | 93,837,013 |  | 93,837,013 | 72,078,019 |  |  |  | 93,837,013

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