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Fair Value of Financial Instruments - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Gas Derivatives      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Derivative Asset $ 24,215 $ 77,662 $ 213
Level 1 | Gas Derivatives      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Derivative Asset 0 0  
Level 1 | Interest Rate Swaps      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Derivative Asset 0 0  
Level 2 | Gas Derivatives      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Derivative Asset (570,910) (1,904,830)  
Level 2 | Interest Rate Swaps      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Derivative Asset 2,331 4,561  
Level 3 | Gas Derivatives      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Derivative Asset 0 0  
Level 3 | Interest Rate Swaps      
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]      
Derivative Asset $ 0 $ 0