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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, 2022
USD ($)
$ / shares
$ / item
Dec. 31, 2021
USD ($)
$ / item
Dec. 31, 2020
USD ($)
Vessels, net        
Estimated useful life   25 years    
Depreciation and amortization | $   $ 60,190 $ 56,231 $ 65,168
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 | $   $ 4,647    
Increase in basic net earnings per share | $ / shares   $ 0.11    
Basic net earnings per share if no change to estimated scrap value | $ / shares   3.63    
Diluted net earnings per share if no change to estimated scrap value | $ / shares   $ 3.59    
Vessels        
Vessels, net        
Depreciation and amortization | $   $ 50,092 $ 49,417 $ 58,008