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SUBSEQUENT EVENTS: (Details) $ / shares in Units, $ in Millions | Apr. 23, 2020 $ / shares | Apr. 16, 2020 USD ($) | Apr. 15, 2020 USD ($) | Jul. 15, 2019 complaint
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Tia Maria | Peru |  |  |  |
SUBSEQUENT EVENTS: |  |  |  |
Number of complaints | complaint |  |  |  | 3
Subsequent Events |  |  |  |
SUBSEQUENT EVENTS: |  |  |  |
Quarterly dividend authorized (in dollars per share) | $ / shares | $ 0.20 |  |  |
Fixed-rate senior unsecured notes issued April 2010 | Subsequent Events |  |  |  |
SUBSEQUENT EVENTS: |  |  |  |
Debt term |  | 10 years |  |
Repayment of debt |  | $ 410.8 | $ 400.0 |
Repayment of principal |  | 400.0 |  |
Accrued interest paid |  | $ 10.8 |  |

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