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COMMITMENTS AND CONTINGENCIES: - Litigation matters (Details) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
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Dec. 27, 2018 USD ($) | Aug. 22, 2018 USD ($) | Mar. 31, 2019 lawsuit | Sep. 30, 2016 lawsuit | Jun. 30, 2015 lawsuit item | Dec. 31, 2015 lawsuit item | Dec. 31, 2012 item | Dec. 31, 2005 item | Dec. 31, 2017 lawsuit | Dec. 31, 2016 item | Mar. 31, 2012
Litigation Matter |  |  |  |  |  |  |  |  |  |  |
Number of collective action lawsuits |  |  |  |  | 6 |  |  |  |  |  |
Number of collective action lawsuits dismissed |  |  |  |  | 2 |  |  |  |  |  |
Remaining number of lawsuits |  |  |  |  | 4 |  |  |  |  |  |
Number of civil actions seeking damages |  |  |  |  |  |  |  |  | 33 |  |
Number Of Constitutional Action Lawsuits |  |  |  |  |  | 4 |  |  |  |  |
Number of subsidiaries to which environmental impact authorizations were granted | item |  |  |  |  |  | 1 |  |  |  |  |
Number of subsidiaries against which lawsuits were filed | item |  |  |  |  | 2 |  |  |  |  |  |
Tia Maria |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits |  |  | 3 |  |  |  |  |  |  |  |
Grupo Mexico and Americas Mining |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |
Amount of Litigation settlement award | $ |  | $ 50,000,000 |  |  |  |  |  |  |  |  |
Amount of litigation settlement | $ | $ 50,000,000 |  |  |  |  |  |  |  |  |  |
Attorneys fees | $ | 13,500,000 |  |  |  |  |  |  |  |  |  |
Incentive fee | $ | 5,000 |  |  |  |  |  |  |  |  |  |
Special dividend | $ | $ 36,500,000 |  |  |  |  |  |  |  |  |  |
Buenavista del Cobre, S.A. de C.V |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |
Number of civil actions seeking damages | item |  |  |  |  |  | 8 |  |  |  | 3 |
Mexico Generadora de Energia, S. de R.L. ("MGE") | Controladora de Infraestructura Energetica Mexico, S. A. de C. V. |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |
Acquisition percentage |  |  |  |  |  |  |  |  |  |  | 99.999%
Mexico | Mexico Generadora de Energia, S. de R.L. ("MGE") |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |
Number of power plants | item |  |  |  |  |  |  | 2 | 2 |  |  |
Mexico | Mexico Generadora de Energia, S. de R.L. ("MGE") | Controladora de Infraestructura Energetica Mexico, S. A. de C. V. |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |
Acquisition percentage |  |  |  |  |  |  | 99.999% |  |  |  |
Francisca Garcia Enriquez |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |
Number of additional constitutional lawsuits filed |  |  |  |  |  | 2 |  |  |  |  |
Mario Alberto Salcido et al; Maria Elena Heredia Bustamante et al; Martin Eligio Ortiz Gamez et al and Maria de los Angeles Enriquez Bacame et al |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |
Number of additional constitutional lawsuits filed |  |  |  | 4 |  |  |  |  |  |  |
Norberto Bustamante et al |  |  |  |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |
Number of additional constitutional lawsuits filed |  |  | 2 |  |  |  |  |  |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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