Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring Basis
Derivative assets	$ 1,079	$ 5,582
Derivative liabilities	45,004	18,467
Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis
Investments		5,072
Netting adjustments, assets	(1,079)	(4,272)
Assets at fair value	0	6,382
Netting adjustments, liabilities	(1,079)	(4,272)
Liabilities at fair value	43,925	14,195
Fair Value, Measurements, Recurring \| Commodity derivative contracts
Fair Value Assets And Liabilities Measured On Recurring Basis
Netting adjustments, assets	(1,079)	(4,272)
Assets at fair value	0	1,310
Netting adjustments, liabilities	(1,079)	(4,272)
Liabilities at fair value	43,925	14,195
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 1
Fair Value Assets And Liabilities Measured On Recurring Basis
Derivative assets	0	5,072
Investments		5,072
Derivative liabilities	0	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	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis
Derivative assets	1,079	5,582
Investments		0
Derivative liabilities	45,004	18,467
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 2 \| Commodity derivative contracts
Fair Value Assets And Liabilities Measured On Recurring Basis
Derivative assets	1,079	5,582
Derivative liabilities	45,004	18,467
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 3
Fair Value Assets And Liabilities Measured On Recurring Basis
Derivative assets	0	0
Investments		0
Derivative liabilities	0	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	0
Derivative liabilities	$ 0	$ 0

Deferred Compensation Plan, Fair Value of Plan Assets

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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.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 50
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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

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