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Inventories and natural gas in storage (Tables)
 9 Months Ended
Sep. 30, 2024
Inventory Disclosure [Abstract]  
Schedule of Inventories Inventories on the Consolidated Balance Sheets were as follows:
 September 30, 2024September 30, 2023December 31, 2023
 (In thousands)
Natural gas in storage (current)$40,770 $29,821 $39,377 
Merchandise for resale38,311 36,815 34,955 
Materials and supplies6,264 7,824 5,460 
Other6,544 5,775 7,600 
Total$91,889 $80,235 $87,392