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Inventories and natural gas in storage (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Inventory Disclosure [Abstract]      
Merchandise for resale $ 32,498 $ 27,910 $ 25,216
Natural gas in storage (current) 15,388 22,533 15,014
Materials and supplies 6,391 6,846 6,269
Other 5,877 6,959 4,478
Total 60,154 64,248 50,977
Natural gas in storage noncurrent $ 47,400 $ 47,500 $ 47,200