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Fair Value - Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Assets    
Total assets $ 297,034,000 $ 235,902,000
Liabilities    
Total liabilities 19,661,000 24,104,000
Money market funds    
Assets    
Money market funds 297,034,000 235,902,000
Option to acquire a variable number of shares of Class A Common Stock    
Liabilities    
Derivatives 13,200,000  
Natural gas fixed price forward contracts    
Liabilities    
Derivatives 0 2,574,000
Embedded EPP Derivative Liability    
Liabilities    
Derivatives 6,461,000 5,541,000
Interest rate swap agreements    
Liabilities    
Derivatives   15,989,000
Level 1    
Assets    
Total assets 297,034,000 235,902,000
Liabilities    
Total liabilities 0 0
Level 1 | Money market funds    
Assets    
Money market funds 297,034,000 235,902,000
Level 1 | Option to acquire a variable number of shares of Class A Common Stock    
Liabilities    
Derivatives 0  
Level 1 | Natural gas fixed price forward contracts    
Liabilities    
Derivatives 0 0
Level 1 | Embedded EPP Derivative Liability    
Liabilities    
Derivatives 0 0
Level 1 | Interest rate swap agreements    
Liabilities    
Derivatives   0
Level 2    
Assets    
Total assets 0 0
Liabilities    
Total liabilities 13,200,000 15,989,000
Level 2 | Money market funds    
Assets    
Money market funds 0 0
Level 2 | Option to acquire a variable number of shares of Class A Common Stock    
Liabilities    
Derivatives 13,200,000  
Level 2 | Natural gas fixed price forward contracts    
Liabilities    
Derivatives 0 0
Level 2 | Embedded EPP Derivative Liability    
Liabilities    
Derivatives 0 0
Level 2 | Interest rate swap agreements    
Liabilities    
Derivatives   15,989,000
Level 3    
Assets    
Total assets 0 0
Liabilities    
Total liabilities 6,461,000 8,115,000
Level 3 | Money market funds    
Assets    
Money market funds 0 0
Level 3 | Option to acquire a variable number of shares of Class A Common Stock    
Liabilities    
Derivatives 0  
Level 3 | Natural gas fixed price forward contracts    
Liabilities    
Derivatives 0 2,574,000
Level 3 | Embedded EPP Derivative Liability    
Liabilities    
Derivatives $ 6,461,000 5,541,000
Level 3 | Interest rate swap agreements    
Liabilities    
Derivatives   $ 0