Derivatives And Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2015

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

Estimated Fair Value Of Derivative Instruments Under Input Levels

	Asset Derivatives				Liability Derivatives
	September 30, 2015		December 31, 2014		September 30, 2015		December 31, 2014
	(in thousands)				(in thousands)
Level 2 derivative instruments	$	—	$	104,608	$	—	$	—
Level 3 derivative instruments	—		44,959		—		—
Total	$	—	$	149,567	$	—	$	—

Changes In Level 3 Fair Values

	For the Three Months Ended September 30,
	2015		2014
	(in thousands)
Balance at beginning of period	$	—	$	(5,533	)
Total gains (losses) for the period:
Unrealized gain on derivatives	—		24,829
Settlements in net derivative gains (losses)	—		(1,542		)
Balance at end of period	$	—	$	17,754
Total gains included in net derivative gains (losses) attributable to the change in unrealized gains related to assets still held at the reporting date	$	—	$	24,485

	For the Nine Months Ended September 30,
	2015			2014
	(in thousands)
Balance at beginning of period	$	44,959		$	23,485
Total gains (losses) for the period:
Unrealized loss on derivatives	(109,240		)	(6,488		)
Settlements in net derivative gains (losses)	64,281			757
Balance at end of period	$	—		$	17,754
Total losses included in net derivative gains (losses) attributable to the change in unrealized losses related to assets still held at the reporting date	$	—		$	(2,476	)

Estimated Fair Value Of Derivative Instruments

	Asset Derivatives				Liability Derivatives
	September 30, 2015		December 31, 2014		September 30, 2015		December 31, 2014
	(in thousands)				(in thousands)
Derivatives not designated as hedges:
Commodity contracts reported in:
Current derivative assets	$	—	$	120,176	$	—	$	—
Noncurrent derivative assets	—		81,187		—		51,796
Total derivatives not designated as hedges	$	—	$	201,363	$	—	$	51,796