Derivatives And Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2013

Credit Risk Derivatives, at Fair Value, Net [Abstract]

Estimated Fair Value Of Derivative Instruments Under Input Levels

	Asset Derivatives				Liability Derivatives
	September 30, 2013		December 31, 2012		September 30, 2013			December 31, 2012
	(in thousands)				(in thousands)
Level 2 inputs	$	146,864	$	207,042	$	(390	)	$	959
Level 3 inputs	14,467		11,595		3,562			16,526
Total	$	161,331	$	218,637	$	3,172		$	17,485

Changes In Level 3 Fair Values

	For the Three Months Ended September 30,
	2013			2012
	(In thousands)
Balance at beginning of period	$	(9,873	)	$	45,345
Total gains (losses) for the period:
Unrealized gain (loss) on derivatives	24,080			(51,685		)
Settlements in production revenue	—			(825		)
Settlements in net derivative gains (losses)	(3,302		)	(6,870		)
Unrealized gains reported in OCI	—			409
Balance at end of period	$	10,905		$	(13,626	)
Total gains included in net derivative gains attributable to the change in unrealized gains related to assets still held at the reporting date	$	24,026		$	(51,685	)

	For the Nine Months Ended September 30,
	2013			2012
	(In thousands)
Balance at beginning of period	$	(4,931	)	$	150,989
Total gains (losses) for the period:
Unrealized gain (loss) on derivatives	24,618			(16,160		)
Transfers out of Level 3	—			(153,418		)
Settlements in production revenue	—			(5,600		)
Settlements in net derivative gains (losses)	(8,782		)	(22,743		)
Unrealized gains reported in OCI	—			33,306
Balance at end of period	$	10,905		$	(13,626	)
Total gains included in net derivative gains attributable to the change in unrealized gains related to assets still held at the reporting date	$	26,788		$	(16,160	)

Price Collars And Swaps For Anticipated Natural Gas And NGL Production

Production Year	Daily Production Volume
	Natural Gas	NGL
	MMcfd	MBbld
Remainder of 2013	200	6
2014 (1)	170	4
2015	150	—
2016-2021	40	—

Net Deferred Hedge Gain in AOCI to be Released into Earnings in a Future Period

	(In thousands)
Remainder of 2013	$	15,254
2014	37,084
2015	33,191
2016	13,476
2017	12,531
2018 and thereafter	41,443
	$	152,979

Reduction Of Interest Expense Over The Life Of The Debt Instruments

	(In thousands)
Remainder of 2013	$	492
2014	2,039
2015	2,194
2016	569
	$	5,294

Estimated Fair Value Of Derivative Instruments

	Asset Derivatives				Liability Derivatives
	September 30, 2013		December 31, 2012		September 30, 2013		December 31, 2012
	(In thousands)				(In thousands)
Derivatives not designated as hedges:
Commodity contracts reported in:
Current derivative assets	$	86,003	$	113,367	$	—	$	—
Noncurrent derivative assets	75,403		107,542		75		2,272
Current derivative liabilities	—		—		—		—
Noncurrent derivative liabilities	448		92		3,620		17,577
Total derivatives not designated as hedges	$	161,854	$	221,001	$	3,695	$	19,849

Carrying Value Of Derivatives

	For the Three Months Ended September 30,
	2012
	Commodity Hedges
	(In thousands)
Derivative fair value at beginning of period	$	176,726
Settlements in production revenue	(45,681		)
Ineffectiveness reported in net derivative gains	(547		)
Unrealized gains (losses) reported in OCI	(15,543		)
Derivative fair value at end of period	$	114,955
	For the Nine Months Ended September 30,
	2012
	Commodity Hedges
	(In thousands)
Derivative fair value at beginning of period	$	342,799
Settlements in production revenue	(137,417		)
Settlements in net derivative gains	(3,820		)
Ineffectiveness reported in net derivative gains	1,022
Unrealized gains reported in OCI	93,103
Derecognition of hedge	(180,732		)
Derivative fair value at end of period	$	114,955