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RELATED PARTY TRANSACTIONS - Transactions with Hygo and Affiliates - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |  |
Operating income (loss) |  | $ 125,653 | $ 60,659 | $ 114,486
Hygo | Voyage, Charter Hire And Commission Expenses |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating income (loss) |  | (2,100) | 1,600 |
Hygo | Debt Guarantee [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Guarantor Obligations, Current Carrying Value | $ 396,600 | 422,300 | 396,600 |
Hygo | Other |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | 0 | (2) | (247)
Loan to related party | $ 7,000 |  | 7,000 |
Hygo | Other | LIBOR |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, rate | 5.00% |  |  |
Hygo | Debt guarantee compensation |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | $ 3,826 | $ 693 | $ 861

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