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INCOME TAXES: - Effective tax rate (Details) - item | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of the statutory income tax rate to the effective tax rate |  |  |
Expected tax at U.S. statutory rate (as a percent) | 21.00% | 21.00% | 35.00%
Foreign tax at other than statutory rate, net of foreign tax credit benefit (as a percent) | 14.00% | 13.90% | 0.60%
Percentage depletion (as a percent) | (2.70%) | (2.10%) | (2.90%)
Other permanent differences (as a percent) | 0.10% | 0.40% | 5.20%
Change in 2017 valuation allowance on U.S. deferred tax assets, foreign tax credits and U.S. tax effect on Peruvian deferred taxes |  | 7.50% | 26.90%
Additional valuation allowance on 2018 U.S. deferred tax assets, foreign tax credits and U.S. tax effect on Peruvian deferred taxes | 10.10% | 1.00% |
Decrease in U.S. deferred tax asset due to tax rate changes |  | (0.20%) | 4.80%
U.S. one time transition tax on accumulated foreign earnings |  | 0.40% | 2.40%
Increase (decrease) in unrecognized tax benefits for uncertain tax positions (as a percent) | (2.10%) |  | 0.70%
Repatriated foreign earnings (as a percent) |  |  | (2.00%)
Amounts (over) / under provided in prior years | (1.10%) | (1.30%) | (0.10%)
Other (as a percent) | (0.30%) | 0.10% | (1.40%)
Effective income tax rate | 39.00% | 40.70% | 69.20%
Number of jurisdictions where company files income tax returns | 3 |  |
Duration for which statutory tax rates for Peru and Mexico are considered to determine effective tax rate | 3 years |  |
Mexico |  |  |
Reconciliation of the statutory income tax rate to the effective tax rate |  |  |
Expected tax at U.S. statutory rate (as a percent) | 30.00% | 30.00% | 30.00%
Peru |  |  |
Reconciliation of the statutory income tax rate to the effective tax rate |  |  |
Expected tax at U.S. statutory rate (as a percent) | 29.50% | 29.50% | 29.50%

X
- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to additional valuation allowance on deferred tax assets, foreign tax credits and deferred tax effects. + References No definition available. + Details
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- Definition Represents the duration for which statutory tax rates for Peru and Mexico considered to determine effective tax rate. + References No definition available. + Details
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- Definition The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the difference between special tax rate applicable to eligible income and the domestic federal statutory income tax rate recorded during the period. + References No definition available. + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to one time toll charge on accumulated foreign earnings. + References No definition available. + Details
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