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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value Measurements [Abstract]

Hierarchy Of Fair Value, Assets And Liabilities Measured On Recurring Basis

			September 30,				September 30,				September 30,				September 30,
		At fair value as of December 31, 2011
		Level 1				Level 2				Level 3				Total
		(In thousands)
Assets (liabilities):
Money market funds		$	250,419			$	—			$	—			$	250,419
Commodity derivative instruments (see Note 4)			—				—				(5,050	)			(5,050	)
Total assets (liabilities)		$	250,419			$	—			$	(5,050	)		$	245,369

			September 30,				September 30,				September 30,				September 30,
		At fair value as of December 31, 2010
		Level 1				Level 2				Level 3				Total
		(In thousands)
Assets (liabilities):
Commodity derivative instruments (see Note 4)		$	—			$	—			$	(10,486	)		$	(10,486	)
Total assets (liabilities)		$	—			$	—			$	(10,486	)		$	(10,486	)

Fair Value Of Derivative Instruments, Measured Recurring Or Nonrecurring Basis, Unobservable Input Reconciliation Classified As Level 3

			September 30,				September 30,				September 30,
		2011				2010				2009
		(In thousands)
Balance as of January 1		$	(10,486	)		$	(2,953	)		$	4,090
Total gains or (losses) (realized or unrealized):
Included in earnings			1,595				(7,653	)			(4,747	)
Included in other comprehensive income			—				—				—
Purchases, issuances and settlements			3,841				120				(2,296	)
Transfers in and out of Level 3			—				—				—
Balance as of December 31		$	(5,050	)		$	(10,486	)		$	(2,953	)
Change in unrealized gains (losses) included in earnings relating to derivatives still held at December 31		$	5,436			$	(7,533	)		$	(7,043	)

X

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c

-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 820

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19279-110258



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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X

- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

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

-Topic 820

-SubTopic 10

-Publisher FASB

-Number

-Article

-Subparagraph

-Name Accounting Standards Codification

-Paragraph 1

-Section 50

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258

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