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Financial instruments - Effects on Statement of Operations of Derivative Financial Instruments Not Designated as Hedges (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Fair Value of Financial Instruments [Line Items]        
Total unrealized gain (loss) on derivative financial instruments $ 1,255 $ 4,882 $ 3,000 $ 9,851
Gain on derivative financial instruments 58 1,039 191 3,205
Renewable energy sales (85) (1,495) (718) (3,851)
Gain (loss) on derivative instruments (27) (456) (527) (646)
Not Designated as Hedging Instrument        
Fair Value of Financial Instruments [Line Items]        
Total unrealized gain (loss) on derivative financial instruments 1,843 84 257 1,190
Energy derivative contracts (1,887) (1,537) (1,783) (3,830)
Loss on derivative financial instruments not accounted for as hedges (44) (1,453) (1,526) (2,640)
Amortization of AOCI gains frozen as a result of hedge dedesignation 17 997 999 1,994
Not Designated as Hedging Instrument | Energy derivative contracts        
Fair Value of Financial Instruments [Line Items]        
Total unrealized gain (loss) on derivative financial instruments 1,843 84 1,147 62
Energy derivative contracts (1,887) (1,537) (1,783) (3,830)
Not Designated as Hedging Instrument | Commodity contracts        
Fair Value of Financial Instruments [Line Items]        
Total unrealized gain (loss) on derivative financial instruments $ 0 $ 0 $ (890) $ 1,128