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CASH FLOW INFORMATION - Non-cash (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Non-cash investing and financing activities      
Reclassification from vessels to vessels held for exchange   $ 38,214  
Reclassification from vessels to vessels held for sale   22,408 $ 10,303
Cash dividends paid $ 13,463 9,847 20,877
Cash paid for interest 11,749 18,420 28,376
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 1,643 857 548
Purchase of scrubbers 6 5 9,520
Purchase of other fixed assets 1,160 142 413
Net proceeds from sale of vessels   99 118
Non-cash financing activities cash dividends payable 157 $ 114 $ 74
Non-cash financing activities for financing costs $ 9