Derivative Instruments - Natural gas derivatives (Details) - Natural gas swaps $ in Thousands, MMBTU in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) MMBTU	Dec. 31, 2023 USD ($)
Derivative Instruments
Derivative asset | $	$ 23,698	$ 25,459
Notional volume of natural gas derivatives (in MMBTUs)	86.3
2024
Derivative Instruments
Notional volume of natural gas derivatives (in MMBTUs)	29.4
2025
Derivative Instruments
Notional volume of natural gas derivatives (in MMBTUs)	25.2
2026
Derivative Instruments
Notional volume of natural gas derivatives (in MMBTUs)	20.9
2027
Derivative Instruments
Notional volume of natural gas derivatives (in MMBTUs)	10.3
2028
Derivative Instruments
Notional volume of natural gas derivatives (in MMBTUs)	0.5