Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis
Commodity derivative contracts, assets, net of offset	$ 144,045	$ 338,417
Commodity derivative contracts, liabilities, net of offset	128	0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis
Netting adjustment, assets	(2,079)	0
Commodity derivative contracts, assets, net of offset	144,045	338,417
Investments	10,882	11,106
Assets measured at fair value	154,927	349,523
Guarantee	3,736	5,104
Netting adjustments, liabilities	(2,079)	0
Commodity derivative contracts, liabilities, net of offset	128
Liabilities measured at fair value	3,864	5,104
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis
Commodity derivative contracts, assets, before netting	0	0
Investments	10,882	11,106
Assets measured at fair value	10,882	11,106
Guarantee	0	0
Commodity derivative contracts, liabilities, before netting	0
Liabilities measured at fair value	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis
Commodity derivative contracts, assets, before netting	146,124	338,067
Investments	0	0
Assets measured at fair value	146,124	338,067
Guarantee	0	0
Commodity derivative contracts, liabilities, before netting	0
Liabilities measured at fair value	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis
Commodity derivative contracts, assets, before netting	0	350
Investments	0	0
Assets measured at fair value	0	350
Guarantee	3,736	5,104
Commodity derivative contracts, liabilities, before netting	2,207
Liabilities measured at fair value	$ 5,943	$ 5,104

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

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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, after the 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 not elected to be offset.

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Fair value, after the 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 not subject to a master netting arrangement and not elected to be offset.

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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 portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value of financial and nonfinancial obligations.

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