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CASH FLOW INFORMATION - Non-cash (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Non-cash investing and financing activities |  |
Cash paid for interest | $ 9,888 | $ 14,577
Cash paid for estimated income taxes | 0 | 0
Reclassification from vessels, net of accumulated depreciation and Deferred drydocking net of accumulated amortization to Vessels held for sale | 6,964 |
Reclassification from vessels to vessels held for sale |  | 20,889
Accounts payable and accrued expenses |  |
Non-cash investing and financing activities |  |
Purchases of vessels and ballast water treatment systems | 512 | 1,241
Purchase of scrubbers | 6 | 25
Purchase of other fixed assets | 199 | 451
Net proceeds from sale of vessels |  | 123
Non-cash financing activities cash dividends payable | 114 | $ 108
Non-cash financing activities for financing costs | $ 620 |

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