Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	$ 3,040	$ 5,582
Derivative liabilities	28,135	18,467
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis
Investments		5,072
Netting adjustments, assets	(3,040)	(4,272)
Assets at fair value	0	6,382
Netting adjustments, liabilities	(3,040)	(4,272)
Liabilities at fair value	25,095	14,195
Fair Value, Measurements, Recurring \| Commodity derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis
Netting adjustments, assets	(3,040)	(4,272)
Assets at fair value	0	1,310
Netting adjustments, liabilities	(3,040)	(4,272)
Liabilities at fair value	25,095	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
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
Investments		0
Derivative assets	3,040	5,582
Derivative liabilities	28,135	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	3,040	5,582
Derivative liabilities	28,135	18,467
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis
Investments		0
Derivative assets	0	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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- Definition

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

+ References

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- Definition

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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- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226003-175313

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
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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
-Topic 860
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-Section 50
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Section 55
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