Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis
Commodity derivative contracts, assets, net of offset	$ 251,406us-gaap_DerivativeAssets	$ 338,417us-gaap_DerivativeAssets
Commodity derivative contracts, liabilities, net of offset	119us-gaap_DerivativeLiabilities	0us-gaap_DerivativeLiabilities
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis
Netting adjustment, assets	(284)	0
Commodity derivative contracts, assets, net of offset	251,406	338,417
Investments	11,679	11,106
Assets measured at fair value	263,085	349,523
Guarantees	4,791	5,104
Netting adjustments, liabilities	(284)	0
Commodity derivative contracts, liabilities, net of offset	119
Liabilities measured at fair value	4,910	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	11,679	11,106
Assets measured at fair value	11,679	11,106
Guarantees	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	249,955	338,067
Investments	0	0
Assets measured at fair value	249,955	338,067
Guarantees	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	1,735	350
Investments	0	0
Assets measured at fair value	1,735	350
Guarantees	4,791	5,104
Commodity derivative contracts, liabilities, before netting	403
Liabilities measured at fair value	$ 5,194	$ 5,104

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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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-Publisher FASB

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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 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, 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 not subject to a master netting arrangement and elected not to be offset.

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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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