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STOCKHOLDERS' EQUITY - Compensation Plan (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 21, 2019 USD ($) $ / shares | Nov. 30, 2018 $ / shares | Nov. 30, 2018 $ / shares | Jan. 31, 2015 $ / shares | Jan. 31, 2015 $ / shares | Dec. 31, 2019 USD ($) $ / shares shares | Sep. 30, 2019 $ / shares | Jun. 30, 2019 $ / shares | Mar. 31, 2019 $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Sep. 30, 2018 $ / shares | Jun. 30, 2018 $ / shares | Mar. 31, 2018 $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend per share |  |  |  |  |  | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.30 | $ 0.30 | $ 1.60 | $ 1.40 |
Grupo Mexico and Americas Mining |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend per share | $ 0.44428 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement dividend paid | $ | $ 36.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal fees paid | $ | $ 13.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Peruvian Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment shareholders' interest in Peruvian Branch (as a percent) |  |  |  |  |  | 0.71% |  |  |  |  |  |  |  | 0.71% |  |
Employee Stock Purchase 2015 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information related to compensation cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price for initial subscription (in dollars per share) | (per share) |  |  |  | $ 1.86 | $ 38.44 |  |  |  |  |  |  |  |  | $ 1.86 |  |
Percentage of title acquired by employee in every two years on shares paid in previous two years |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Period of plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 years |  |
Ratio of bonus shares granted to participant |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.1 |  |
Stock based compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.6 | $ 0.6 | $ 0.6
Unrecognized compensation expense | $ |  |  |  |  |  | $ 2.0 |  |  |  | $ 2.6 |  |  |  | $ 2.0 | $ 2.6 | $ 3.2
Stock award activity, Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding shares at the beginning of the period | shares |  |  |  |  |  |  |  |  | 1,840,336 |  |  |  | 2,293,120 | 1,840,336 | 2,293,120 |
Exercised (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | (460,602) | (452,784) |
Outstanding shares at the end of the period | shares |  |  |  |  |  | 1,379,734 |  |  |  | 1,840,336 |  |  |  | 1,379,734 | 1,840,336 | 2,293,120
Unit Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding shares at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.63 |  |  |  | $ 2.63 | $ 2.63 | $ 2.63 |
Exercised (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.63 | 2.63 |
Outstanding shares at the end of the period (in dollars per share) |  |  |  |  |  | $ 2.63 |  |  |  | $ 2.63 |  |  |  | $ 2.63 | $ 2.63 | $ 2.63
Employee Stock Purchase 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information related to compensation cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price for initial subscription (in dollars per share) | (per share) |  | $ 1.86 | $ 37.89 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of title acquired by employee in every two years on shares paid in previous two years |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Period of plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 years |  |
Ratio of bonus shares granted to participant |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.1 |  |
Stock based compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.7 |  |
Unrecognized compensation expense | $ |  |  |  |  |  | $ 4.5 |  |  |  |  |  |  |  | $ 4.5 |  |
Stock award activity, Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding shares at the beginning of the period | shares |  |  |  |  |  |  |  |  | 2,782,424 |  |  |  |  | 2,782,424 |  |
Granted (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,238,169 | 2,782,424 |
Exercised (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | (17,695) |  |
Outstanding shares at the end of the period | shares |  |  |  |  |  | 4,002,898 |  |  |  | 2,782,424 |  |  |  | 4,002,898 | 2,782,424 |
Unit Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding shares at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.86 |  |  |  |  | $ 1.86 |  |
Granted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.86 | $ 1.86 |
Exercised (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.86 |  |
Outstanding shares at the end of the period (in dollars per share) |  |  |  |  |  | $ 1.86 |  |  |  | $ 1.86 |  |  |  | $ 1.86 | $ 1.86 |
Directors' Stock Award Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information related to compensation cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.4 | $ 0.4 |
Stock award activity, Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,400 | 16,000 |

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