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Tangible fixed assets - Impairment (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
Tangible fixed assets      
Loss on sale of vessels   $ 171 $ (630)
Tangible fixed assets   $ 1,677,771 $ 1,888,583
Discount rate applied to cash flow projections   8.40% 7.50%
Steam vessels      
Tangible fixed assets      
Number of vessels for which value in use is lower than carrying amount | item   2  
Number of vessels | item   3  
Impairment loss   $ (4,444)  
Impairment reversal resulting from potential increase in re-chartering rate   (22,034)  
Impairment loss resulting from potential decrease in re-chartering rate   $ 14,027  
Discount rate applied to cash flow projections   8.40% 7.50%
Percentage of increase or decrease in the discount rate for sensitivity analysis   0.50%  
Impairment loss due to increase in discount rate   $ 2,927  
Impairment reversal due to decrease in discount rate   (2,929)  
Steam vessels | Average      
Tangible fixed assets      
Charter market rate used (per day)   35 $ 35
Increase or decrease in re-chartering rate for sensitivity analysis   5  
Steam vessels impaired during current period      
Tangible fixed assets      
Impairment loss   (4,444)  
Tangible fixed assets   130,400  
Methane Jane Elizabeth      
Tangible fixed assets      
Impairment loss   (1,412)  
Tangible fixed assets   65,408  
Methane Alison Victoria      
Tangible fixed assets      
Impairment loss   (3,032)  
Tangible fixed assets   64,992  
Methane Shirley Elisabeth      
Tangible fixed assets      
Carrying amount reclassified as "Vessel held for sale" $ 67,339    
Impairment loss from remeasurement at lower of carrying amount and fair value less costs to sell 14,664    
Loss on sale of vessels   (166)  
Methane Heather Sally      
Tangible fixed assets      
Carrying amount reclassified as "Vessel held for sale" 74,123    
Impairment loss from remeasurement at lower of carrying amount and fair value less costs to sell $ 13,363    
Gain arising from sale and leaseback transactions   $ 337