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Operating segments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Operating segments      
Number of geographic segments | segment 2    
Total operating revenues $ 3,258,973 $ 2,847,190 $ 2,200,300
Non-derivative financial instruments   (21,378) (21,378)
Domestic      
Operating segments      
Total operating revenues 2,060,744 1,909,744 1,661,927
United States of America      
Operating segments      
Total operating revenues 931,184 758,609 509,976
Central America and South America      
Operating segments      
Total operating revenues $ 267,045 $ 178,837 $ 49,775