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CASH FLOW INFORMATION - Non-cash (Details) - USD ($)
$ in Thousands
 6 Months Ended
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