Derivative Instruments and Hedging Activities, Part 2 (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Values of Derivative Instruments in the Consolidated Balance Sheet [Abstract]
Derivative Assets, Current	$ 0	$ 622
Derivative Liabilities, Current	0	362
Designated as Hedging Instrument [Member]
Fair Values of Derivative Instruments in the Consolidated Balance Sheet [Abstract]
Derivative Liabilities, Total	0	245
Derivative Assets, Total	0	622
Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Fair value of derivatives, asset, current [Member]
Fair Values of Derivative Instruments in the Consolidated Balance Sheet [Abstract]
Derivative Assets, Current	0	622
Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Fair value of derivatives, liability, current [Member]
Fair Values of Derivative Instruments in the Consolidated Balance Sheet [Abstract]
Derivative Liabilities, Current	0	245
Not Designated as Hedging Instrument [Member]
Fair Values of Derivative Instruments in the Consolidated Balance Sheet [Abstract]
Derivative Liabilities, Total	0	117
Derivative Assets, Total	0	0
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Fair value of derivatives, asset, current [Member]
Fair Values of Derivative Instruments in the Consolidated Balance Sheet [Abstract]
Derivative Assets, Current	0	0
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Fair value of derivatives, liability, current [Member]
Fair Values of Derivative Instruments in the Consolidated Balance Sheet [Abstract]
Derivative Liabilities, Current	$ 0	$ 117

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details

Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

+ References

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+ Details

- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details

- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name FASB Staff Position (FSP)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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+ Details