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STOCKHOLDERS' EQUITY - Employee Stock Purchase Plan (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2018 $ / shares | Nov. 30, 2018 $ / shares | Jan. 31, 2015 $ / shares | Jan. 31, 2015 $ / shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares
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) |  |  | $ 38.44 | $ 2.63 | $ 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 | $ |  |  |  |  | $ 0.2 | $ 0.6 | $ 0.6
Unrecognized compensation expense | $ |  |  |  |  |  | $ 0.2 | $ 0.8
Stock award activity, Shares |  |  |  |  |  |  |
Outstanding shares at the beginning of the period | shares |  |  |  |  | 845,895 | 867,234 |
Exercised (in shares) | shares |  |  |  |  | (801,056) | (21,339) |
Outstanding shares at the end of the period | shares |  |  |  |  | 44,839 | 845,895 | 867,234
Unit Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Outstanding shares at the beginning of the period (in dollars per share) | $ / shares |  |  |  |  | $ 2.63 | $ 2.63 |
Exercised (in dollars per share) | $ / shares |  |  |  |  | 2.63 | 2.63 |
Outstanding shares at the end of the period (in dollars per share) | $ / shares |  |  |  |  | $ 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) | $ 37.89 | $ 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 | $ |  |  |  |  | $ 0.7 | $ 0.7 | $ 0.7
Unrecognized compensation expense | $ |  |  |  |  | $ 1.7 | $ 2.4 | $ 3.1
Stock award activity, Shares |  |  |  |  |  |  |
Outstanding shares at the beginning of the period | shares |  |  |  |  | 2,754,506 | 3,173,924 |
Exercised (in shares) | shares |  |  |  |  | (791,570) | (419,418) |
Outstanding shares at the end of the period | shares |  |  |  |  | 1,962,936 | 2,754,506 | 3,173,924
Unit Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Outstanding shares at the beginning of the period (in dollars per share) | $ / shares |  |  |  |  | $ 1.86 | $ 1.86 |
Exercised (in dollars per share) | $ / shares |  |  |  |  | 1.86 | 1.86 |
Outstanding shares at the end of the period (in dollars per share) | $ / shares |  |  |  |  | $ 1.86 | $ 1.86 | $ 1.86

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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