Fair Value Accounting and Financial Instruments - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairments for intangibles		$ 0	$ 0
Intangible assets	$ 82,235,000	111,731,000
Energy risk management assets, current | Natural gas derivatives | Derivatives not designated as hedging instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, collateral	0	$ 0
Trade name
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairments for intangibles	3,800,000
Intangible assets	$ 0			$ 0
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Trade name | Discount rate | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.08