Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments - Balance Sheet Classification of Fair Value of Derivative Instruments (Details)

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Derivative Instruments - Balance Sheet Classification of Fair Value of Derivative Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Other Long-term Assets | Natural Gas Swap    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Natural gas swap asset (included in Other long-term assets) $ 391 $ 0
Derivative Liability | Warrant    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Warrant liabilities (included in Derivative liabilities) $ (160,630) $ 0