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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