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CASH FLOW INFORMATION - Non-cash (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Non-cash investing and financing activities |  |  |
Reclassification from vessels to vessels held for sale | $ 22,408 | $ 10,303 | $ 5,702
Reclassification from vessels to vessels held for exchange | 38,214 |  |
Cash dividends paid | 9,847 | 20,877 |
Cash paid for interest | 18,420 | 28,376 | 30,167
Cash paid for estimated income taxes | 0 | 0 | 0
Accounts payable and accrued expenses |  |  |
Non-cash investing and financing activities |  |  |
Purchases of vessels and ballast water treatment systems | 857 | 548 | 2,228
Purchase of scrubbers | 5 | 9,520 | 428
Purchase of other fixed assets | 142 | 413 | 360
Net proceeds from sale of vessels | 99 | 118 | 262
Non-cash financing activities common stock issuance costs |  |  | 105
Non-cash financing activities for deferred financing costs |  |  | $ 1
Cash dividends paid | $ 114 | $ 74 |

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