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Fair Value Measurements (Recurring Fair Value Measurements) (Details) (Commodity Derivatives [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Assets	$ 26,758	$ 31,139
Gross Liabilities	(45)	0
Derivative Asset	26,713us-gaap_DerivativeAssets	31,139us-gaap_DerivativeAssets
Derivative Liability	0us-gaap_DerivativeLiabilities	0us-gaap_DerivativeLiabilities
Financial assets (liabilities)	26,713	31,139
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Assets	25,856	27,784
Gross Liabilities	0	0
Financial assets (liabilities)	25,856	27,784
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Assets	902	3,355
Gross Liabilities	(45)	0
Financial assets (liabilities)	857	3,355
Effect of Netting [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Effect of netting on assets	(45)	0
Effect of netting on liabilities	45	0
Financial assets (liabilities)	$ 0	$ 0

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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- Definition

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.

+ References+ Details