Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	$ 5,286
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis
Netting adjustments, assets	0
Assets at fair value	5,286
Fair Value, Measurements, Recurring \| Commodity derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis
Netting adjustments, assets	0
Assets at fair value	5,286
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 1 \| Commodity derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	5,286
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 2 \| Commodity derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	5,286
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 3 \| Commodity derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	$ 0

Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 55
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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.

+ References

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-Name Accounting Standards Codification
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