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Derivative instruments (Tables)

9 Months Ended

Sep. 30, 2012

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments (Tables)

The location and fair value of the Company's derivative instruments in the Consolidated Balance Sheets were as follows:

Asset Derivatives	Location on Consolidated Balance Sheets	Fair Value at September 30, 2012			Fair Value at September 30, 2011			Fair Value at December 31, 2011
		(In thousands)
Designated as hedges:
Commodity derivatives	Commodity derivative instruments	$	18,619		$	38,458		$	27,687
	Other assets - noncurrent	3,463			15,575			2,768
		22,082			54,033			30,455
Not designated as hedges:
Commodity derivatives	Commodity derivative instruments	574			336			—
	Other assets - noncurrent	63			—			—
		637			336			—
Total asset derivatives		$	22,719		$	54,369		$	30,455

Liability Derivatives	Location on Consolidated Balance Sheets	Fair Value at September 30, 2012			Fair Value at September 30, 2011			Fair Value at December 31, 2011
		(In thousands)
Designated as hedges:
Commodity derivatives	Commodity derivative instruments	$	1,958		$	1,723		$	12,727
	Other liabilities - noncurrent	83			157			937
Interest rate derivatives	Other accrued liabilities	7,779			—			827
	Other liabilities - noncurrent	—			3,491			3,935
		9,820			5,371			18,426
Not designated as hedges:
Commodity derivatives	Commodity derivative instruments	114			1,305			437
		114			1,305			437
Total liability derivatives		$	9,934		$	6,676		$	18,863

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- Definition

Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.

+ References

Reference 1: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-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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