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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Measurements

Assets and liabilities measured at fair value on a recurring basis

					Fair value measurements at reporting date using
Description		March 31, 2012			Quoted prices in active markets for identical assets (Level 1)			Significant other observable inputs (Level 2)			Significant unobservable inputs (Level 3)
		(Thousands)
Assets
Derivative instruments, at fair value		$	608,647		$	2,077		$	450,504		$	156,066
Total assets		$	608,647		$	2,077		$	450,504		$	156,066
Liabilities
Derivative instruments, at fair value		$	120,044		$	2,774		$	117,270		$	—
Total liabilities		$	120,044		$	2,774		$	117,270		$	—

					Fair value measurements at reporting date using
Description		December 31, 2011			Quoted prices in active markets for identical assets (Level 1)			Significant other observable inputs (Level 2)			Significant unobservable inputs (Level 3)
		(Thousands)
Assets
Derivative instruments, at fair value		$	512,161		$	3,612		$	365,238		$	143,311
Total assets		$	512,161		$	3,612		$	365,238		$	143,311
Liabilities
Derivative instruments, at fair value		$	123,306		$	2,727		$	120,528		$	51
Total liabilities		$	123,306		$	2,727		$	120,528		$	51

Fair value measurements using significant unobservable inputs (Level 3)

		Fair value measurements using significant unobservable inputs (Level 3)
		Derivative instruments, at fair value, net Three months ended March 31,
		2012			2011
		(Thousands)
Balance at January 1		$	143,260		$	116,672
Total gains or losses:
Included in earnings		—			14
Included in other comprehensive income		31,596			(5,831		)
Settlements		(18,790		)	(13,491		)
Transfers in and/or out of Level 3		—			—
Balance at March 31		$	156,066		$	97,364

X

- Definition

This element represents the fair value measurement of assets and liabilities 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 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 (net); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs).

+ References

No definition available.

+ Details

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- Details

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- 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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