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DEBT - 500 Million Revolver (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
item
Nov. 29, 2023
USD ($)
Dec. 31, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
item
Debt          
Number of vessels in fleet | item 46   46 44 42
Long-term debt, net $ 190,169   $ 190,169 $ 164,921  
Repayment of the outstanding debt          
Total debt $ 200,000   200,000 $ 171,000  
$500 Million Revolver          
Debt          
Repayment of secured debt     $ 9,750    
$500 Million Revolver | Secured Debt          
Debt          
Maximum borrowing capacity   $ 500,000      
Margin increase or decrease based on performance of emissions targets   0.05%      
Average age of collateral vessels for repayment of loan   20 years      
Consecutive quarterly commitment reductions   $ 15,000      
Number of vessels to serve as collateral under debt agreement | item 45        
Number of vessels in fleet | item 46   46    
Commitment fee on unused daily average unutilized commitment (as a percent)   40.00%      
Remaining borrowing capacity $ 294,795   $ 294,795    
Repayment of secured debt     9,750    
Long-term debt, net 190,169   190,169    
Repayment of the outstanding debt          
2028 200,000   200,000    
Total debt $ 200,000   $ 200,000    
Minimum | SOFR | $500 Million Revolver | Secured Debt          
Debt          
Applicable margin over reference rate   1.85%      
Maximum | SOFR | $500 Million Revolver | Secured Debt          
Debt          
Applicable margin over reference rate   2.15%