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STOCKHOLDERS' EQUITY: - Directors Stock Award Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Parent Company (Grupo Mexico) |  |
Activity in directors' stock award plan |  |
Treasury stock balance at the end of the period (in shares) |  | 79,800,655
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 |
Total SCC shares reserved for the plan | 600,000 | 600,000
Period of extension of plan | 5 years |
Increased share awards issued to directors | 1,600 |
Stock based compensation expense | $ 0.3 | $ 0.3
Activity in directors' stock award plan |  |
Total shares granted at the beginning of the period (in shares) | (405,200) | (391,600)
Granted (in shares) | 11,600 | 13,600
Total shares granted at the end of the period (in shares) | (416,800) | (405,200)
Remaining shares reserved | 183,200 | 194,800
New 2021 grant |  |
Share based Compensation Plan |  |
Numbers of shares shall be granted quarterly and conditioned upon the attendance of each director to each Board meeting | 1,600 |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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