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COMMITMENTS AND CONTINGENCIES: - Environmental matters (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2011 category person
Environmental costs |  |  |
Environmental capital investment | $ 19.2 | $ 26.4 |
Peru |  |  |
Environmental costs |  |  |
Environmental capital investment | 10.2 | 6.5 |
Mexico |  |  |
Environmental costs |  |  |
Environmental capital investment | $ 9.0 | $ 19.9 |
Number of categories of collective actions | category |  |  | 3
Minimum number of people claiming injury due to collective action initiative in Civil Federal Procedures Code (CFPC) | person |  |  | 30

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- Definition Represents the minimum number of people claiming injury, to initiate collective action for environmental matters. + References No definition available. + Details
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- Definition Represents the number of categories of collective actions for environmental matters. + References No definition available. + Details
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- Definition Amount of environmental remediation costs capitalized. These expenditures may relate to long-lived improvements in operating facilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 25 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=39739230&loc=d3e11660-110855 + Details
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