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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels, net (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jan. 01, 2022
$ / item
Dec. 31, 2023
USD ($)
$ / shares
$ / item
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / item
Vessels, net        
Estimated useful life   25 years    
Depreciation and amortization | $   $ 66,465 $ 60,190 $ 56,231
Estimated scrap value (in dollars per lightweight ton) | $ / item 400 400   310
Estimated life of average scrap value of steel 15 years      
Decrease in depreciation expense | $   $ 4,513 $ 4,647  
(Decrease) increase in basic net earnings per share   $ (0.11) $ 0.11  
(Decrease) increase in diluted net earnings per share   (0.10) 0.11  
Basic net earnings per share if no change to estimated scrap value   0.41 3.63  
Diluted net earnings per share if no change to estimated scrap value   $ 0.40 $ 3.59  
Vessels        
Vessels, net        
Depreciation and amortization | $   $ 50,525 $ 50,092 $ 49,417