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STOCKHOLDERS' EQUITY: (Details 3) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2015 MXN / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares | Dec. 31, 2010 MXN / shares | Dec. 31, 2010 $ / shares
Directors' Stock Award Plan |  |  |  |  |  |
Share based Compensation Plan |  |  |  |  |  |
Common shares received on election as director |  | 1,200 |  |  |  |
Additional shares issued at each annual general meeting |  | 1,200 |  |  |  |
Stock based compensation expense | $ |  | $ 0.4 | $ 0.3 |  |  |
Total SCC shares reserved for the plan | 600,000 | 600,000 | 600,000 |  |  |
Activity in directors' stock award plan |  |  |  |  |  |
Total shares granted at the beginning of the period (in shares) |  | (309,600) | (297,600) |  |  |
Granted in the period (in shares) |  | (13,200) | (12,000) |  |  |
Total shares granted at the end of the period (in shares) |  | (322,800) | (309,600) | (297,600) |  |
Remaining shares reserved | 277,200 | 277,200 | 290,400 |  |  |
Employee Stock Purchase 2007 Plan |  |  |  |  |  |
Share based Compensation Plan |  |  |  |  |  |
Stock based compensation expense | $ |  |  | $ 2.1 | $ 2.1 |  |
Share based compensation |  |  |  |  |  |
Percentage of title acquired by employee in every two years on shares paid in previous two years |  | 50.00% |  |  |  |
Period describing the expiration of the contribution period and the bonus eligibility |  | 8 years |  |  |  |
Bonus shares granted to participant (as a ratio) |  | 0.1 |  |  |  |
Employee Stock Purchase 2010 Plan |  |  |  |  |  |
Share based Compensation Plan |  |  |  |  |  |
Stock based compensation expense | $ |  | $ 0.6 | $ 0.6 | $ 0.6 |  |
Share based compensation |  |  |  |  |  |
Purchase price for initial subscription (in dollars per share) | (per share) |  |  |  |  | MXN 26.51 | $ 1.54
Employee Stock Purchase 2015 Plan |  |  |  |  |  |
Share based Compensation Plan |  |  |  |  |  |
Stock based compensation expense | $ |  | $ 0.4 |  |  |  |
Activity in directors' stock award plan |  |  |  |  |  |
Granted in the period (in shares) |  | (2,652,386) |  |  |  |
Share based compensation |  |  |  |  |  |
Purchase price for initial subscription (in dollars per share) | (per share) | MXN 38.44 | $ 2.23 |  |  |  |
Percentage of title acquired by employee in every two years on shares paid in previous two years |  | 50.00% |  |  |  |
Period describing the expiration of the contribution period and the bonus eligibility |  | 8 years |  |  |  |
Bonus shares granted to participant (as a ratio) |  | 0.1 |  |  |  |

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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