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Derivative Instruments and Hedging Activities (Derivatives Fair Value By Balance Sheet Location) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Asset Fair Value	$ 6,011	$ 60
Liability Fair Value	(1,330)	(1,108)
Net Derivative Fair Value	4,681	(1,048)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Fair Value	6,011	60
Liability Fair Value	(1,330)	(1,108)
Net Derivative Fair Value	4,681	(1,048)
Current liabilities - Fair market value of derivatives [Member] \| Not Designated as Hedging Instrument [Member] \| Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Liability Fair Value	(47)
Net Derivative Fair Value	(47)
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	(418)	(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	(41)	(72)
Net Derivative Fair Value	(41)	(72)
Non-current liabilities - Other long-term liabilities [Member] \| Not Designated as Hedging Instrument [Member] \| Crude Oil [Member]
Derivatives, Fair Value [Line Items]
Liability Fair Value	(824)
Net Derivative Fair Value	(824)
Current assets - Fair market value of derivatives [Member] \| Not Designated as Hedging Instrument [Member] \| Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Asset Fair Value		60
Net Derivative Fair Value		60
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	4,842
Non-current assets - Other long-term assets [Member] \| Not Designated as Hedging Instrument [Member] \| Crude Oil [Member]
Derivatives, Fair Value [Line Items]
Asset Fair Value	1,169
Net Derivative Fair Value	1,169
Balance Sheet Current [Member] \| Not Designated as Hedging Instrument [Member] \| Crude Oil [Member]
Derivatives, Fair Value [Line Items]
Net Derivative Fair Value	$ 4,424	$ (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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