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Fair Value Measurements - Significant Unobservable Inputs Used to Value Level 3 Instruments (Details 2) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 USD ($) $ / MWh $ / MMBTU | Dec. 31, 2022 USD ($) $ / MWh $ / MMBTU
Information regarding the entity's internally developed significant unobservable inputs used to value its level 3 instruments |  |
Assets | $ 1,511,685 | $ 1,552,870
Liabilities | 99,257 | 42,446
Level 3 |  |
Information regarding the entity's internally developed significant unobservable inputs used to value its level 3 instruments |  |
Assets | 21,257 | 26,132
Liabilities | 14,635 | 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 | 21,257 | 26,132
Liabilities | $ 14,635 | $ 31,020
Level 3 | Forward Contracts | Valuation Technique, Discounted Cash Flow | 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 | 37.79
Natural gas forward price (in usd per MMBTu) | $ / MMBTU | (0.02) | (11.81)
Level 3 | Forward Contracts | Valuation Technique, Discounted Cash Flow | 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 | 306.34 | 310.69
Natural gas forward price (in usd per MMBTu) | $ / MMBTU | 0.14 | 0.00
Level 3 | Forward Contracts | Valuation Technique, Discounted Cash Flow | 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 | 157.00 | 163.92
Natural gas forward price (in usd per MMBTu) | $ / MMBTU | 0.02 | (5.08)
Level 3 | Forward Contracts | Valuation Technique, Discounted Cash Flow | Electricity | Commodity Contracts |  |
Information regarding the entity's internally developed significant unobservable inputs used to value its level 3 instruments |  |
Assets | $ 21,084 | $ 26,132
Liabilities | 14,385 | 1,759
Level 3 | Forward Contracts | Valuation Technique, Discounted Cash Flow | Natural Gas | Commodity Contracts |  |
Information regarding the entity's internally developed significant unobservable inputs used to value its level 3 instruments |  |
Assets | 173 | 0
Liabilities | $ 250 | $ 29,261

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