Derivative Instruments and Fair Value Measurements - Use of Derivative Instruments (Details) - Commodity Contract - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 1,005	$ 61
Liability derivatives	0	0
Less counterparty offsets	0	0
As reported fair value contracts	1,005	61
Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Liability derivatives	0	0
Less counterparty offsets	0	0
As reported fair value contracts	0	0
Current Liabilities
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Liability derivatives	964	52
Less counterparty offsets	0	0
As reported fair value contracts	964	52
Other Liabilities
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Liability derivatives	0	0
Less counterparty offsets	0	0
As reported fair value contracts	$ 0	$ 0

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after effects of master netting arrangements, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Current liabilities attributable to energy marketing activities (trading activities). Current energy marketing (trading activities) are when entities engage in both financial and physical trading to increase profits, manage their commodity price risk and enhance system reliability. They may trade electricity, coal, natural gas and oil. These entities typically use a variety of financial instruments, including forward contracts, options and swaps.

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