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Inventories and natural gas in storage (Tables)
9 Months Ended
Sep. 30, 2025
Inventory Disclosure [Abstract]  
Schedule of Inventories Inventories on the Consolidated Balance Sheets were as follows:
 September 30, 2025September 30, 2024December 31, 2024
 (In thousands)
Natural gas in storage (current)$40,077 $40,770 $40,073 
Fuel stock4,195 4,196 4,867 
Total$44,272 $44,966 $44,940