Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2011

Fair Value Measurements

Assets and liabilities measured at fair value on a recurring basis

			Fair value measurements at reporting date using
Description	September 30, 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	$	313,537	$	7,014	$	193,439	$	113,084
Total assets	$	313,537	$	7,014	$	193,439	$	113,084
Liabilities
Derivative instruments, at fair value	$	108,926	$	8,271	$	100,655	$	–
Total liabilities	$	108,926	$	8,271	$	100,655	$	–

Fair value measurements using significant unobservable inputs (Level 3)

	Fair value measurements using significant unobservable inputs (Level 3)
	Derivative instruments, at fair value, net
	(Thousands)
Balance at January 1, 2011	$	116,672
Total gains or losses:
Included in earnings	14
Included in other comprehensive income	35,121
Settlements	(38,723		)
Transfers in and/or out of Level 3	–
Balance at September 30, 2011	$	113,084
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held as of September 30, 2011	$	–