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RELATED PARTY TRANSACTIONS - Transactions with Hygo and Affiliates - Net Revenues (Details) - Hygo - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |
Net (expenses) income (due to) from related parties | $ 10,887 | $ 7,805 | $ 8,181
Management and administrative services revenue |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties | 5,281 | 5,904 | 6,167
Ship management fees income |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties | 1,780 | 1,210 | 1,400
Debt guarantee compensation |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction amount | 3,826 | 693 | 861
Other |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction amount | $ 0 | $ (2) | $ (247)

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