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Financial Instruments (Details 4) (Derivatives not designated as cash-flow hedging instruments [Member], Cash Flow Hedging [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Derivatives not designated as cash-flow hedge instruments:
Amount of gain/loss recognized in income	$ (1,843)	$ (3,660)
Unrealized loss on derivative instruments, net [Member] | Natural gas commodity contracts [Member]
Derivatives not designated as cash-flow hedge instruments:
Amount of gain/loss recognized in income	(1,522)
Unrealized loss on derivative instruments, net [Member] | Crude oil commodity contracts [Member]
Derivatives not designated as cash-flow hedge instruments:
Amount of gain/loss recognized in income	(531)	(3,779)
Realized gain (Loss) on derivative instruments, net [Member] | Natural gas commodity contracts [Member]
Derivatives not designated as cash-flow hedge instruments:
Amount of gain/loss recognized in income	373
Realized gain (Loss) on derivative instruments, net [Member] | Crude oil commodity contracts [Member]
Derivatives not designated as cash-flow hedge instruments:
Amount of gain/loss recognized in income	$ (133)	$ 119

X

- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a),(c),(d),(e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-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.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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