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STOCKHOLDERS' EQUITY: - Employee Stock Purchase Plan (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
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Nov. 30, 2018 $ / shares | Nov. 30, 2018 $ / shares | Jan. 31, 2015 $ / shares | Jan. 31, 2015 $ / shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares
Retained earnings |  |  |  |  |  |  |
Dividends paid as cash dividend (in dollars per share) |  |  |  |  | $ 3.50 | $ 3.20 | $ 1.50
Peruvian Operations |  |  |  |  |  |  |
Non-controlling interest |  |  |  |  |  |  |
Investment shareholders' interest in Peruvian Branch (as a percent) |  |  |  |  | 0.71% |  |
Employee Stock Purchase 2015 Plan |  |  |  |  |  |  |
Information related to compensation cost |  |  |  |  |  |  |
Purchase price for initial subscription (in dollars per share) | (per share) |  |  | $ 2.63 | $ 38.44 | $ 2.63 |  |
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 | $ |  |  |  |  | $ 0.2 | $ 0.8 | $ 1.4
Stock award activity, Shares |  |  |  |  |  |  |
Outstanding shares at the beginning of the period | shares |  |  |  |  | 867,234 | 1,264,410 |
Exercised (in shares) | shares |  |  |  |  | (21,339) | (397,176) |
Outstanding shares at the end of the period | shares |  |  |  |  | 845,895 | 867,234 | 1,264,410
Unit Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Outstanding shares at the beginning of the period (in dollars per share) |  |  |  |  | $ 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
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 | $ 0.7 | $ 0.7
Unrecognized compensation expense | $ |  |  |  |  | $ 2.4 | $ 3.1 | $ 3.8
Stock award activity, Shares |  |  |  |  |  |  |
Outstanding shares at the beginning of the period | shares |  |  |  |  | 3,173,924 | 3,918,458 |
Exercised (in shares) | shares |  |  |  |  | (419,418) | (744,534) |
Outstanding shares at the end of the period | shares |  |  |  |  | 2,754,506 | 3,173,924 | 3,918,458
Unit Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Outstanding shares at the beginning of the period (in dollars per share) |  |  |  |  | $ 1.86 | $ 1.86 |
Exercised (in dollars per share) |  |  |  |  | 1.86 | 1.86 |
Outstanding shares at the end of the period (in dollars per share) |  |  |  |  | $ 1.86 | $ 1.86 | $ 1.86

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