Derivatives And Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

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

Estimated Fair Value Of Derivative Instruments Under Input Levels

	Asset Derivatives As of December 31,				Liability Derivatives As of December 31,
	2013		2012		2013		2012
	(in thousands)				(in thousands)
Level 2 inputs	$	107,395	$	207,042	$	3,448	$	959
Level 3 inputs	23,485		11,595		—		16,526
Total	$	130,880	$	218,637	$	3,448	$	17,485

Changes In Level 3 Fair Values

	As of December 31,
	2013			2012
	(In thousands)
Balance at beginning of period	$	(4,931	)	$	150,989
Total gains (losses) for the period:
Unrealized gain on derivatives	40,398			19,451
Transfers out of Level 3	—			(180,732		)
Settlements in production revenue	—			(3,738		)
Settlements in net derivative losses	(11,982		)	(25,203		)
Unrealized gains reported in OCI	—			34,302
Balance at end of period	$	23,485		$	(4,931	)
Total gains included in net derivative gains attributable to the change in unrealized gains related to assets still held at the reporting date	$	41,909		$	19,451

Price Collars And Swaps For Anticipated Natural Gas Production

Production Year	Daily Production Volume
	Natural Gas	NGL	Natural Gas Basis Swaps
	MMcfd	MBbld	MMcfd
2014 (1)	170	4	40
2015	150	—	—
2016-2021	40	—	—

⁽¹⁾ Our 2014 NGL derivatives end in September. Our natural gas derivatives and AECO to NYMEX natural gas basis swaps are in place for the whole of 2014.

Net Deferred Hedge Gain in AOCI to be Released into Earnings in a Future Period [Table Text Block]

	(In thousands)
2014	$	37,084
2015	33,191
2016	13,476
2017	12,531
2018 and thereafter	$	41,443
	$	137,725

Reduction Of Interest Expense Over The Life Of The Debt Instruments

	(In thousands)
2014	2,039
2015	2,194
2016	569
	$	4,802

Estimated Fair Value Of Derivative Instruments

	Asset Derivatives				Liability Derivatives
	As of December 31,				As of December 31,
	2013		2012		2013		2012
	(In thousands)				(In thousands)
Derivatives not designated as hedges:
Commodity contracts reported in:
Current derivative assets	$	60,063	$	113,367	$	2,540	$	—
Noncurrent derivative assets	105,315		107,542		31,958		2,272
Current derivative liabilities	—		—		3,125		—
Noncurrent derivative liabilities	—		92		323		17,577
Total derivatives not designated as hedges	$	165,378	$	221,001	$	37,946	$	19,849

Carrying Value Of Derivatives

	For the Year Ended December 31, 2012
	Commodity Hedges
	(In thousands)
Derivative fair value at beginning of period	$	342,799
Settlements in production revenue	(176,084		)
Settlements in net derivative gains	(3,820		)
Ineffectiveness reported in net derivative gains	1,281
Unrealized gains reported in OCI	107,112
Derecognition of hedge	(271,288		)
Derivative fair value at end of period	$	—

Held-to-maturity Securities

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	(In thousands)
Marketable securities (held-to-maturity)
Time deposits	$	29,419	$	—	$	(22	)	$	29,397
Commercial paper	136,924		27		(25		)	136,926
Marketable securities	$	166,343	$	27	$	(47	)	$	166,323