Supplemental Oil And Gas Disclosures (Tables)

12 Months Ended

Dec. 31, 2013

Supplemental Oil and Gas Disclosures [Abstract]

Schedule Of Capitalized Costs And Costs Incurred On Oil And Gas Properties

The capitalized costs at year-end and costs incurred during the year were as follows:

	2013			2012			2011
	(In thousands)
Capitalized costs:
Proved properties	$	4,235,712		$	3,822,381		$	3,302,032
Unproved properties	545,588			521,659			185,632
	4,781,300			4,344,040			3,487,664
Accumulated depreciation, depletion, amortization, and impairment	(2,439,458		)	(2,216,787		)	(1,724,312		)
Net capitalized costs	$	2,341,842		$	2,127,253		$	1,763,352
Cost incurred:
Unproved properties acquired	$	76,304		$	420,467		$	70,999
Proved properties acquired	—			225,669			50,013
Exploration	33,373			46,467			43,836
Development	424,314			390,649			391,862
Asset retirement obligation	(17,951		)	45,097			23,345
Total costs incurred	$	516,040		$	1,128,349		$	580,055

Schedule Of The Oil And Natural Gas Property Costs Not Being Amortized

The following table shows a summary of the oil and natural gas property costs not being amortized at December 31, 2013, by the year in which such costs were incurred:

	2013		2012		2011		2010 and Prior		Total
	(In thousands)
Unproved properties acquired and wells in progress	$	92,929	$	412,623	$	32,492	$	7,544	$	545,588

Results Of Operations For Producing Activities

The results of operations for producing activities are as follows:

	2013			2012			2011
	(In thousands)
Revenues	$	633,792		$	557,003		$	505,450
Production costs	(162,822		)	(131,389		)	(115,400		)
Depreciation, depletion, amortization, and impairment	(222,672		)	(492,475		)	(181,960		)
	248,298			(66,861		)	208,090
Income tax (expense) benefit	(96,091		)	27,533			(80,323		)
Results of operations for producing activities (excluding corporate overhead and financing costs)	$	152,207		$	(39,328	)	$	127,767

Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities

Estimated quantities of proved developed oil, NGLs, and natural gas reserves and changes in net quantities of proved developed and undeveloped oil, NGLs, and natural gas reserves were as follows:

	Oil Bbls		NGLs Bbls		Natural Gas Mcf
	(In thousands)
2013
Proved Developed and Undeveloped Reserves:
Beginning of Year	21,998		35,166		555,647
Revision of Previous Estimates	(2,113	)	836		2,421
Extensions and Discoveries	4,678		7,273		68,611
Infill Reserves in Existing Proved Fields	2,299		1,945		21,573
Purchases of Minerals in Place	—		—		11
Production	(3,360	)	(3,914	)	(56,757	)
Sales	(1,737	)	(101	)	(9,722	)
End of Year	21,765		41,205		581,784
Proved Developed Reserves:
Beginning of Year	16,441		25,657		452,844
End of Year	15,594		30,437		464,234
Proved Undeveloped Reserves:
Beginning of Year	5,557		9,509		102,803
End of Year	6,171		10,768		117,550
2012
Proved Developed and Undeveloped Reserves:
Beginning of Year	20,255		22,087		442,135
Revision of Previous Estimates (1)	(1,747	)	(2,682	)	(55,110	)
Extensions and Discoveries	5,014		4,819		54,761
Infill Reserves in Existing Proved Fields	4,196		3,018		25,057
Purchases of Minerals in Place	2,830		11,098		141,494
Production	(3,279	)	(2,796	)	(48,930	)
Sales	(5,271	)	(378	)	(3,760	)
End of Year	21,998		35,166		555,647
Proved Developed Reserves:
Beginning of Year	15,618		16,649		372,311
End of Year	16,441		25,657		452,844
Proved Undeveloped Reserves:
Beginning of Year	4,637		5,438		69,824
End of Year	5,557		9,509		102,803
2011
Proved Developed and Undeveloped Reserves:
Beginning of Year	17,494		16,117		420,486
Revision of Previous Estimates (1)	374		2,112		(30,510	)
Extensions and Discoveries	3,477		3,924		39,836
Infill Reserves in Existing Proved Fields	1,229		1,780		15,592
Purchases of Minerals in Place	192		393		40,835
Production	(2,511	)	(2,239	)	(44,104	)
Sales	—		—		—
End of Year	20,255		22,087		442,135
Proved Developed Reserves:
Beginning of Year	12,773		12,088		346,928
End of Year	15,618		16,649		372,311
Proved Undeveloped Reserves:
Beginning of Year	4,721		4,029		73,558
End of Year	4,637		5,438		69,824

_________________________

(1) Natural gas revisions of previous estimates decreased primarily due to a decline in natural gas prices.

Standardized Measure Of Discounted Future Cash Flows Relating To Proved Reserves Disclosure

The standardized measure of discounted future net cash flows (SMOG) was calculated using 12-month average prices and year-end costs and statutory tax rates, adjusted for permanent differences that relate to existing proved oil, NGLs, and natural gas reserves. SMOG as of December 31 is as follows:

	2013			2012			2011
	(In thousands)
Future cash flows	$	5,573,119		$	4,522,351		$	4,583,629
Future production costs	(1,734,985		)	(1,405,773		)	(1,277,856		)
Future development costs	(571,170		)	(431,673		)	(340,992		)
Future income tax expenses	(1,044,608		)	(762,519		)	(952,736		)
Future net cash flows	2,222,356			1,922,386			2,012,045
10% annual discount for estimated timing of cash flows	(996,380		)	(842,430		)	(924,136		)
Standardized measure of discounted future net cash flows relating to proved oil, NGLs, and natural gas reserves	$	1,225,976		$	1,079,956		$	1,087,909

Schedule Of Principal Sources Of Changes In Standardized Measure Of Discounted Future Net Cash Flows

The principal sources of changes in the standardized measure of discounted future net cash flows were as follows:

	2013			2012			2011
	(In thousands)
Sales and transfers of oil and natural gas produced, net of production costs	$	(470,970	)	$	(425,626	)	$	(389,339	)
Net changes in prices and production costs	188,826			(321,099		)	115,852
Revisions in quantity estimates and changes in production timing	(10,650		)	(148,648		)	(38,336		)
Extensions, discoveries and improved recovery, less related costs	426,377			432,058			401,134
Changes in estimated future development costs	26,629			51,587			37,742
Previously estimated cost incurred during the period	96,457			104,377			45,327
Purchases of minerals in place	9			283,774			58,567
Sales of minerals in place	(43,435		)	(112,359		)	(29		)
Accretion of discount	147,579			157,842			128,492
Net change in income taxes	(170,091		)	94,678			(60,675		)
Other—net	(44,711		)	(124,537		)	(65,912		)
Net change	146,020			(7,953		)	232,823
Beginning of year	1,079,956			1,087,909			855,086
End of year	$	1,225,976		$	1,079,956		$	1,087,909