Fair Value Measurements - Significant Unobservable Inputs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) $ / MMBTU $ / MWh	Dec. 31, 2021 USD ($) $ / MMBTU
Information regarding the entity's internally developed significant unobservable inputs used to value its level 3 instruments
Assets	$ 1,552,870	$ 1,763,556
Liabilities	42,446
Level 3
Information regarding the entity's internally developed significant unobservable inputs used to value its level 3 instruments
Assets	26,132	0
Liabilities	31,020
Level 3 | Forward Contracts | Commodity Contracts
Information regarding the entity's internally developed significant unobservable inputs used to value its level 3 instruments
Assets	26,132	0
Liabilities	$ 31,020	$ 2,738
Level 3 | Forward Contracts | Discounted Cash Flows | Commodity Contracts | Weighted Average
Information regarding the entity's internally developed significant unobservable inputs used to value its level 3 instruments
Electricity forward price (in usd per MWh) | $ / MWh	163.92
Natural gas forward price (in usd per MMBTu) | $ / MMBTU	(5.08)	(0.71)
Level 3 | Forward Contracts | Discounted Cash Flows | Commodity Contracts | Minimum
Information regarding the entity's internally developed significant unobservable inputs used to value its level 3 instruments
Electricity forward price (in usd per MWh) | $ / MWh	37.79
Natural gas forward price (in usd per MMBTu) | $ / MMBTU	(11.81)	0.76
Level 3 | Forward Contracts | Discounted Cash Flows | Commodity Contracts | Maximum
Information regarding the entity's internally developed significant unobservable inputs used to value its level 3 instruments
Electricity forward price (in usd per MWh) | $ / MWh	310.69
Natural gas forward price (in usd per MMBTu) | $ / MMBTU	0.00	0.65
Level 3 | Forward Contracts | Discounted Cash Flows | Electricity: | Commodity Contracts
Information regarding the entity's internally developed significant unobservable inputs used to value its level 3 instruments
Assets	$ 26,132
Liabilities	1,759
Level 3 | Forward Contracts | Discounted Cash Flows | Natural Gas: | Commodity Contracts
Information regarding the entity's internally developed significant unobservable inputs used to value its level 3 instruments
Assets	0	$ 0
Liabilities	$ 29,261	$ 2,738