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Inventories and natural gas in storage (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Inventory Disclosure [Abstract]      
Merchandise for resale $ 36,815 $ 27,910 $ 26,538
Natural gas in storage (current) 29,821 22,533 48,532
Materials and supplies 7,824 6,846 9,917
Other 5,775 6,959 4,827
Total 80,235 64,248 89,814
Natural gas in storage noncurrent $ 47,400 $ 47,500 $ 47,200