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Inventories and natural gas in storage (Tables)
 9 Months Ended
Sep. 30, 2023
Inventory Disclosure [Abstract]  
Inventories Inventories on the Consolidated Balance Sheets were as follows:
 September 30, 2023September 30, 2022December 31, 2022
 (In thousands)
Merchandise for resale36,815 26,538 27,910 
Natural gas in storage (current)29,821 48,532 22,533 
Materials and supplies$7,824 $9,917 $6,846 
Other5,775 4,827 6,959 
Total$80,235 $89,814 $64,248