Derivatives And Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2014

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

Estimated Fair Value Of Derivative Instruments Under Input Levels

	Asset Derivatives				Liability Derivatives
	September 30, 2014		December 31, 2013		September 30, 2014		December 31, 2013
	(in thousands)				(in thousands)
Level 2 derivative instruments	$	74,312	$	107,395	$	846	$	3,448
Level 3 derivative instruments	17,754		23,485		—		—
Total	$	92,066	$	130,880	$	846	$	3,448

Changes In Level 3 Fair Values

	For the Three Months Ended September 30,
	2014			2013
	(in thousands)
Balance at beginning of period	$	(5,533	)	$	(9,873	)
Total gains (losses) for the period:
Unrealized gain (loss) on derivatives	24,829			24,080
Settlements in net derivative gains (losses)	(1,542		)	(3,302		)
Balance at end of period	$	17,754		$	10,905
Total gains (losses) included in net derivative gains (losses) attributable to the change in unrealized gains (losses) related to assets still held at the reporting date	$	24,485		$	24,026

	For the Nine Months Ended September 30,
	2014			2013
	(in thousands)
Balance at beginning of period	$	23,485		$	(4,931	)
Total gains (losses) for the period:
Unrealized gain (loss) on derivatives	(6,488		)	24,618
Settlements in net derivative gains (losses)	757			(8,782		)
Balance at end of period	$	17,754		$	10,905
Total gains (losses) included in net derivative gains (losses) attributable to the change in unrealized gains (losses) related to assets still held at the reporting date	$	(2,476	)	$	26,788

Marketable Securities

	December 31, 2013
	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

Price Collars And Swaps For Anticipated Natural Gas And NGL Production

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

⁽¹⁾  Our natural gas basis swaps economically hedge the AECO basis adjustment from NYMEX.

Estimated Fair Value Of Derivative Instruments

	Asset Derivatives				Liability Derivatives
	September 30, 2014		December 31, 2013		September 30, 2014		December 31, 2013
	(in thousands)				(in thousands)
Derivatives not designated as hedges:
Commodity contracts reported in:
Current derivative assets	$	66,278	$	60,063	$	180	$	2,540
Noncurrent derivative assets	75,911		105,315		49,943		31,958
Current derivative liabilities	—		—		846		3,125
Noncurrent derivative liabilities	—		—		—		323
Total derivatives not designated as hedges	$	142,189	$	165,378	$	50,969	$	37,946