Fair Value - Narrative (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on derivative		$ (900,000)	$ 600,000
Cash flow hedge gain (loss) to be reclassified within 12 months	$ 10,800,000
Natural gas fixed price forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	$ 0	$ 0	$ 2,574,000
Measurement Input, Long-term Revenue Growth Rate | Valuation Technique, Option Pricing Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded derivative liability, unobservable inputs	0.07	0.07	0.07
Measurement Input, Price Volatility | Valuation Technique, Option Pricing Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded derivative liability, unobservable inputs	0.20	0.20	0.20
Not designated as hedging instrument | Natural Gas Fixed Price Forward Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	$ 0	$ 0	$ 2,574,000
Gain (loss) on derivative		1,100,000	(100,000)
Gain on the settlement of contracts		$ 1,500,000	$ 4,500,000