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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Bunker swaps and Forward Purchase Agreements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Summary of Significant Accounting Policies |  |  |  |  |
Fair value of derivative instruments | $ 4,030 |  | $ 4,030 |  | $ 6,312
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] | Prepaid Expense and Other Assets, Current |  | Prepaid Expense and Other Assets, Current |  | Prepaid Expense and Other Assets, Current
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] | Accounts Payable and Accrued Liabilities, Current |  | Accounts Payable and Accrued Liabilities, Current |  | Accounts Payable and Accrued Liabilities, Current
Bunker Swap and Forward Fuel Purchase Agreements |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |
Fair value of derivative instruments | $ 18 |  | $ 18 |  | $ 168
Fair value of liability position | 2 |  | 2 |  | $ 71
Other income (expense) | Bunker Swap and Forward Fuel Purchase Agreements |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |
Realized (losses) gains | (27) | $ 667 | 81 | $ 1,296 |
Unrealized (losses) gains | $ (38) | $ 321 | $ (80) | $ 1,760 |

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