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SHARE CAPITAL (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jul. 24, 2018 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |
Shares issued under ATM program (in shares) |  | 11,037,273 | 11,868 | 0 |  |
Net proceeds from issuance of shares |  | $ 98,415,000 | $ 85,000 | $ 0 |  |
Share issued as consideration for Trafigura acquisition (in shares) | 16,035,856 | 16,035,856 | 0 | 0 |  |
Shares issued for purchase of assets, grant date fair value (in dollars per share) | $ 7.92 | $ 7.92 |  |  |  |
Share capital, shares outstanding (in shares) |  | 196,894,321 | 169,821,192 | 169,809,324 |  | 169,809,324
At-The-Market Offering |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Equity distribution agreement, maximum value of shares authorized |  |  |  |  | $ 100,000,000.0 |
Shares issued under ATM program (in shares) |  | 11,037,273 |  |  |  |

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