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Revenues - Additional Information (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
charter
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Disaggregation of Revenue [Line Items]      
Time charter revenue $ 235,129 $ 146,499  
Revenue from premium for use of scrubbers $ 10,071 $ 13,929  
Number of vessels employed under voyage charter | charter 0    
Remaining performance obligation     $ 222
Minimum      
Disaggregation of Revenue [Line Items]      
Charter contract renewal term 1 month    
Charter contract typical term 1 month    
Premium for use of scrubbers, sulfur content 0.50%    
Maximum      
Disaggregation of Revenue [Line Items]      
Charter contract renewal term 12 months    
Charter contract typical term 5 years    
Premium for use of scrubbers, sulfur content 3.50%