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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels, net (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2022
$ / item
Jun. 30, 2022
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
Dec. 31, 2021
$ / item
Vessels, net            
Estimated useful life       25 years    
Depreciation and amortization | $   $ 14,521 $ 13,769 $ 28,579 $ 27,209  
Estimated scrap value (in dollars per lightweight ton) | $ / item 400         310
Estimated life of average scrap value of steel 15 years          
Decrease in depreciation expense | $   $ 1,159   $ 2,304    
Increase in basic net earnings per share   $ 0.03   $ 0.06    
Increase in diluted net earnings per share   0.02   0.05    
Basic net earnings per share if no change to estimated scrap value   1.09   2.05    
Diluted net earnings per share if no change to estimated scrap value   $ 1.08   $ 2.02    
Vessels            
Vessels, net            
Depreciation and amortization | $   $ 12,411 $ 12,045 $ 24,595 $ 23,814