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Derivative Instruments - Realized and unrealized gains (losses) on derivative instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Gains and (losses) on derivative instruments          
Net unrealized gains on derivative instruments     $ 22,090   $ 13,445
Natural gas swaps          
Gains and (losses) on derivative instruments          
Gains $ 564 $ 5 605 $ 140  
Losses (6,194) (7,207) (14,646) (16,604)  
Total $ (5,630) $ (7,202) (14,041) $ (16,464)  
Natural gas swaps | Regulatory liability          
Gains and (losses) on derivative instruments          
Net unrealized gains on derivative instruments     $ 22,090   $ 13,445