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COMMITMENTS AND CONTINGENCIES: - Litigation Matters (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2018 lawsuit item	Dec. 31, 2012 item	Dec. 31, 2005 item	Mar. 31, 2012
Tia Maria
Litigation Matter
Number of lawsuits | lawsuit	4
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%
Peru | Labor Matters
Litigation Matter
Percentage of labor unionized	74.00%
Total number of workers	4,660
Number of labor unions	6
Number of labor unions represent majority of workers	1
Number of labor unions other than majority workers unions	5
Term of agreement	3 years
Annual salary increase (as a percent)	5.00%
Mexico | Mexico Generadora de Energia, S. de R.L. ("MGE")
Litigation Matter
Number of power plants		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%

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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