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Inventories and natural gas in storage (Tables)
 6 Months Ended
Jun. 30, 2023
Inventory Disclosure [Abstract]  
Inventories Inventories on the Consolidated Balance Sheets were as follows:
 June 30, 2023June 30, 2022December 31, 2022
 (In thousands)
Merchandise for resale32,498 25,216 27,910 
Natural gas in storage (current)15,388 15,014 22,533 
Materials and supplies$6,391 $6,269 $6,846 
Other5,877 4,478 6,959 
Total$60,154 $50,977 $64,248