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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 not subject to a master netting arrangement and elected not to be offset.

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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, and obligation to return cash collateral under master netting arrangements.

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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, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of asset associated with financial liability or 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, and right to receive cash collateral under master netting arrangements.

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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	$ 3,915
Assets, Fair Value Disclosure [Abstract]
Derivative assets		$ 114
Fair Value, Measurements, Recurring
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement
Assets, Fair Value Disclosure [Abstract]
Netting adjustments, assets		0
Assets at fair value		114
Fair Value, Measurements, Recurring \| Commodity derivative contracts
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	3,915
Assets, Fair Value Disclosure [Abstract]
Netting adjustments, assets		0
Assets at fair value		114
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 1
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities
Assets, Fair Value Disclosure [Abstract]
Derivative assets		0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 1 \| Commodity derivative contracts
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	0
Assets, Fair Value Disclosure [Abstract]
Derivative assets		0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 2
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities
Assets, Fair Value Disclosure [Abstract]
Derivative assets		114
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 2 \| Commodity derivative contracts
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	3,915
Assets, Fair Value Disclosure [Abstract]
Derivative assets		114
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 3
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities
Assets, Fair Value Disclosure [Abstract]
Derivative assets		0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 3 \| Commodity derivative contracts
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	$ 0
Assets, Fair Value Disclosure [Abstract]
Derivative assets		$ 0