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Derivative Instruments and Hedging Activities (Derivatives Fair Value By Balance Sheet Location) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Asset Fair Value		$ 60
Liability Fair Value	(2,686)	(1,108)
Net Derivative Fair Value		(1,048)
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset Fair Value		60
Liability Fair Value	(2,686)	(1,108)
Net Derivative Fair Value	(2,686)	(1,048)
Current liabilities - Fair market value of derivatives [Member] \| Not Designated as Hedging Instrument [Member] \| Natural Gas [Member]
Derivative [Line Items]
Asset Fair Value		60
Liability Fair Value	(160)
Net Derivative Fair Value	(160)	60
Non-current liabilities - Other long-term liabilities [Member] \| Not Designated as Hedging Instrument [Member] \| Natural Gas [Member]
Derivative [Line Items]
Liability Fair Value	(41)	(72)
Net Derivative Fair Value	(41)	(72)
Current assets - Fair market value of derivatives [Member] \| Not Designated as Hedging Instrument [Member] \| Crude Oil [Member]
Derivative [Line Items]
Liability Fair Value	(2,485)	(1,036)
Net Derivative Fair Value	$ (2,485)	$ (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 assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details