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Derivative Instruments and Hedging Activities (Derivatives Fair Value By Balance Sheet Location) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Asset Fair Value	$ 27,850us-gaap_DerivativeAssets	$ 60us-gaap_DerivativeAssets
Liability Fair Value	(1,249)us-gaap_DerivativeLiabilities	(1,108)us-gaap_DerivativeLiabilities
Net Derivative Fair Value	26,601	(1,048)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Fair Value	27,850	60
Liability Fair Value	(1,249)	(1,108)
Net Derivative Fair Value	26,601	(1,048)
Current liabilities - Fair market value of derivatives [Member] \| Not Designated as Hedging Instrument [Member] \| Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Asset Fair Value	1,262	60
Liability Fair Value	(7)
Net Derivative Fair Value	1,255	60
Current liabilities - Fair market value of derivatives [Member] \| Not Designated as Hedging Instrument [Member] \| Crude Oil [Member]
Derivatives, Fair Value [Line Items]
Liability Fair Value	(1,242)	(1,036)
Non-current liabilities - Other long-term liabilities [Member] \| Not Designated as Hedging Instrument [Member] \| Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Liability Fair Value		(72)
Net Derivative Fair Value		(72)
Current assets - Fair market value of derivatives [Member] \| Not Designated as Hedging Instrument [Member] \| Crude Oil [Member]
Derivatives, Fair Value [Line Items]
Asset Fair Value	26,588
Balance Sheet Current [Member] \| Not Designated as Hedging Instrument [Member] \| Crude Oil [Member]
Derivatives, Fair Value [Line Items]
Net Derivative Fair Value	$ 25,346	$ (1,036)

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.

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