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INCOME TAXES: (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
INCOME TAXES: |  |  |  |  |
Income tax provision | $ 125,336 | $ 175,405 | $ 411,571 | $ 605,336 |
Effective income tax rate (as a percent) |  |  | 38.10% | 38.40% |
Income Taxes |  |  |  |  |
Statutory income tax provision |  |  | $ 366,800 | $ 505,500 |
Peruvian royalty |  |  | 3,000 | 6,600 |
Mexican royalty |  |  | 22,800 | 64,900 |
Peruvian special mining tax |  |  | 19,000 | 28,300 |
Changes in the entity's uncertain tax positions | $ 0 |  | 0 |  |
Peru |  |  |  |  |
Income Taxes |  |  |  |  |
Peruvian royalty |  |  | $ 3,000 | 6,600 |
Increment in operating income margin for royalty tax (as a percent) |  |  | 5.00% |  |
Increase in royalty tax rate for each 5% increase up to 12% increase in operating income margin (as a percent) |  |  | 0.75% |  |
Royalty charge |  |  | $ 18,500 | 25,500 |
Increase in special mining tax rate for each 5% increase up to 85% increase in operating income margin (as a percent) |  |  | 0.40% |  |
Accrued special mining tax |  |  | $ 19,000 | 28,300 |
Income tax rate ( as a percent) |  |  |  |  | 30.00%
Dividend tax rate |  |  |  |  | 4.10%
Peru | Minimum |  |  |  |  |
Income Taxes |  |  |  |  |
Mining royalty tax (as a percent) |  |  | 1.00% |  |
Royalty charge assessed as a percentage of net sales |  |  | 1.00% |  |
Special mine tax (as a percent) |  |  | 2.00% |  |
Increment in operating income margin (as a percent) |  |  | 5.00% |  |
Peru | Maximum |  |  |  |  |
Income Taxes |  |  |  |  |
Mining royalty tax (as a percent) |  |  | 12.00% |  |
Operating income margin for royalty tax (as a percent) |  |  | 10.00% |  |
Increment in operating income margin for royalty tax (as a percent) |  |  | 12.00% |  |
Special mine tax (as a percent) |  |  | 8.40% |  |
Operating income margin (as a percent) |  |  | 10.00% |  |
Increment in operating income margin (as a percent) |  |  | 85.00% |  |
Mexico |  |  |  |  |
Income Taxes |  |  |  |  |
Mexican royalty |  |  | $ 22,800 | $ 64,900 |
Mining royalty tax (as a percent) |  |  | 7.50% |  |
Additional royalty tax over net sales from sales of gold, silver and platinum (as a percent) |  |  | 0.50% |  |
2015 - 2016 |  |  |  |  |
Income Taxes |  |  |  |  |
Income tax rate ( as a percent) |  |  |  |  | 28.00%
Dividend tax rate |  |  |  |  | 6.80%
2017 - 2018 |  |  |  |  |
Income Taxes |  |  |  |  |
Income tax rate ( as a percent) |  |  |  |  | 27.00%
Dividend tax rate |  |  |  |  | 8.00%
2019 and later |  |  |  |  |
Income Taxes |  |  |  |  |
Income tax rate ( as a percent) |  |  |  |  | 26.00%
Dividend tax rate |  |  |  |  | 9.30%

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