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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