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Derivative Instruments - Realized and unrealized gains and (losses) on derivative instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Gains and (losses) on derivative instruments          
Net unrealized gains on derivative instruments     $ 192,026   $ 63,994
Natural gas swaps          
Gains and (losses) on derivative instruments          
Gains $ 57,639 $ 15,831 108,280 $ 18,229  
Losses (2,995) 0 (3,277) (1,311)  
Total $ 54,644 $ 15,831 105,003 $ 16,918  
Natural gas swaps | Regulatory liability          
Gains and (losses) on derivative instruments          
Net unrealized gains on derivative instruments     $ 192,026   $ 63,994