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Right of use assets and related lease liabilities - Right of use asset activity (Details)
$ in Thousands
3 Months Ended 12 Months Ended 24 Months Ended
Sep. 30, 2022
vessel
Jun. 30, 2022
vessel
Mar. 31, 2022
USD ($)
vessel
Dec. 31, 2023
USD ($)
vessel
Dec. 31, 2022
USD ($)
vessel
Dec. 31, 2021
USD ($)
Dec. 31, 2023
USD ($)
vessel
Cost              
Beginning balance       $ 689,826      
Accumulated depreciation and impairment              
Charge for the period       (24,244) $ (38,827) $ (42,786)  
Ending balance       0 $ 689,826   $ 0
Number of vessels sold | vessel 2 9 7   18   20
Gross carrying amount              
Cost              
Beginning balance     $ 859,808 820,660 $ 859,808   $ 859,808
Transfer to vessels, net       (851,327)      
Additions       33,302      
Fully depreciated assets       (2,635)      
Disposal of vessels         (39,148)    
Right of use asset cost       0 820,660   0
Accumulated depreciation and impairment              
Fully depreciated assets       (2,635)      
Disposal of vessels         (39,148)    
Ending balance         820,660 859,808  
Accumulated depreciation and impairment              
Cost              
Transfer to vessels, net       152,443      
Fully depreciated assets       (2,635)      
Disposal of vessels         3,776    
Accumulated depreciation and impairment              
Beginning accumulated depreciation     95,783 130,834 95,783   95,783
Charge for the period       (24,244) (38,827)    
Fully depreciated assets       (2,635)      
Disposal of vessels         3,776    
Ending accumulated depreciation       0 130,834 95,783 0
Vessels              
Cost              
Beginning balance       683,181      
Accumulated depreciation and impairment              
Ending balance       $ 0 $ 683,181   $ 0
Vessels | STI Majestic              
Accumulated depreciation and impairment              
Number of vessels sold | vessel         1    
Vessels | Lease option to purchase option exercised              
Accumulated depreciation and impairment              
Number of ships, purchase options exercised | vessel       21     21
Vessels | Gross carrying amount              
Cost              
Beginning balance     836,246 $ 798,083 $ 836,246   $ 836,246
Transfer to vessels, net       (831,385)      
Additions       33,302      
Fully depreciated assets       0      
Disposal of vessels         (38,163)    
Right of use asset cost       0 798,083   0
Accumulated depreciation and impairment              
Fully depreciated assets       0      
Disposal of vessels         (38,163)    
Ending balance         798,083 836,246  
Vessels | Accumulated depreciation and impairment              
Cost              
Transfer to vessels, net       136,223      
Fully depreciated assets       0      
Disposal of vessels         3,247    
Accumulated depreciation and impairment              
Beginning accumulated depreciation     84,221 114,902 84,221   84,221
Charge for the period       (21,321) (33,928)    
Fully depreciated assets       0      
Disposal of vessels         3,247    
Ending accumulated depreciation       0 114,902 84,221 0
Drydock              
Cost              
Beginning balance       6,645      
Accumulated depreciation and impairment              
Ending balance       0 6,645   0
Drydock | Gross carrying amount              
Cost              
Beginning balance     23,562 22,577 23,562   23,562
Transfer to vessels, net       (19,942)      
Additions       0      
Fully depreciated assets       (2,635)      
Disposal of vessels         (985)    
Right of use asset cost       0 22,577   0
Accumulated depreciation and impairment              
Fully depreciated assets       (2,635)      
Disposal of vessels         (985)    
Ending balance         22,577 23,562  
Drydock | Accumulated depreciation and impairment              
Cost              
Transfer to vessels, net       16,220      
Fully depreciated assets       (2,635)      
Disposal of vessels         529    
Accumulated depreciation and impairment              
Beginning accumulated depreciation     $ 11,562 15,932 11,562   11,562
Charge for the period       (2,923) (4,899)    
Fully depreciated assets       (2,635)      
Disposal of vessels         529    
Ending accumulated depreciation       $ 0 $ 15,932 $ 11,562 $ 0