Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	$ 224	$ 5,582
Derivative liabilities	43,847	18,467
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis
Investments		5,072
Netting adjustments, assets	(151)	(4,272)
Assets at fair value	73	6,382
Netting adjustments, liabilities	(151)	(4,272)
Liabilities at fair value	43,696	14,195
Fair Value, Measurements, Recurring \| Commodity derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis
Netting adjustments, assets	(151)	(4,272)
Assets at fair value	73	1,310
Netting adjustments, liabilities	(151)	(4,272)
Liabilities at fair value	43,696	14,195
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis
Investments		5,072
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	224	5,582
Derivative liabilities	43,847	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	224	5,582
Derivative liabilities	43,847	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

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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

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-Publisher FASB
-Name Accounting Standards Codification
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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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