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CASH FLOW INFORMATION - Non-cash (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Non-cash investing and financing activities |  |
Cash paid for interest | $ 6,764 | $ 10,457
Cash paid for estimated income taxes | 0 | 0
Reclassification from deposits on vessels to vessels, net of accumulated depreciation | 7,798 |
Reclassification from vessels to vessels held for sale | 23,252 |
Accounts payable and accrued expenses |  |
Non-cash investing and financing activities |  |
Purchases of vessels and ballast water treatment systems | 497 | 1,726
Purchase of scrubbers | 27 | 33
Purchase of other fixed assets | 35 | 490
Net proceeds from sale of vessels |  | 13
Non-cash financing activities net proceeds from sale of assets | 7 |
Non-cash financing activities cash dividends payable | $ 86 | 103
Non-cash financing activities for financing costs |  | $ 179

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