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Inventories and natural gas in storage (Tables)
 3 Months Ended
Mar. 31, 2024
Inventory Disclosure [Abstract]  
Inventories Inventories on the Consolidated Balance Sheets were as follows:
 March 31, 2024March 31, 2023December 31, 2023
 (In thousands)
Merchandise for resale38,280 29,934 34,955 
Natural gas in storage (current)9,309 8,662 39,377 
Materials and supplies$3,636 $7,064 $5,460 
Other6,204 6,959 7,600 
Total$57,429 $52,619 $87,392