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Inventories and natural gas in storage (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Inventory Disclosure [Abstract]      
Merchandise for resale $ 38,280 $ 34,955 $ 29,934
Natural gas in storage (current) 9,309 39,377 8,662
Materials and supplies 3,636 5,460 7,064
Other 6,204 7,600 6,959
Total 57,429 87,392 52,619
Natural gas in storage noncurrent $ 50,100 $ 48,500 $ 47,400