v3.26.1
Financial risk management, Market Risk (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2025
USD ($)
$ / Mg
Dec. 31, 2024
USD ($)
$ / Mg
Dec. 31, 2023
USD ($)
$ / Mg
Interest bearing financial instruments [Abstract]      
Interest rate swaps in other gains or losses $ 559,479 $ 992,318 $ 1,012,888
Increase/decrease by other variables including tax rate basis 5.00% 3.00%  
Price Risk [Member] | Time Charters and Voyage Charters [Member]      
Price Risk [Abstract]      
Percentage of shipping revenue 7.00% 5.00% 5.00%
Percentage of fuel oil cost accounted for operating expenses 43.00% 47.00% 47.00%
Increase/decrease in price of fuel oil per metric ton | $ / Mg 1 1 1
Increase/decrease in fuel oil consumption expense due to price risk $ 838,920 $ 891,737 $ 801,249
Interest Rate Risk [Member]      
Interest Rate Risk [Abstract]      
Hedge ratio 1    
Interest bearing financial instruments [Abstract]      
Term of variable rate basis     3 months
Increase/decrease by other variables including tax rate basis 0.50%    
Increase/decrease by interest expense on the portion of the borrowings not covered by interest rate swap instruments $ 1,500 2,800 $ 1,800
Increase/decrease in net results due to changes in basis points no hedging in place 2,300 4,800 5,800
Interest Rate Risk [Member] | Interest Rate Swaps [Member]      
Interest bearing financial instruments [Abstract]      
Interest rate swaps in other gains or losses $ 2,600 $ 4,400 $ 6,600
Interest Rate Risk [Member] | Bottom of Range [Member]      
Interest Rate Risk [Abstract]      
Percentage of interest rate risk exposure adopted 40.00% 40.00%  
Interest Rate Risk [Member] | Top of Range [Member]      
Interest Rate Risk [Abstract]      
Percentage of interest rate risk exposure adopted 75.00% 75.00%  
Interest Rate Risk [Member] | Floating Interest Rate [Member]      
Interest Rate Risk [Abstract]      
Percentage of notional principal amount of interest rate swaps 35.00% 45.00% 80.00%
Interest bearing financial instruments [Abstract]      
Financial assets $ 59,845 $ 64,133 $ 69,626
Financial liabilities 1,122,976 1,122,249 1,251,990
Effect of interest rate swaps (394,760) (506,197) (1,005,586)
Total assets (liabilities) $ 788,061 $ 680,185 $ 316,030