Natural Gas And Oil Producing Acitivities (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Natural Gas And Oil Properties [Abstract]

Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure

	2013			2012
	(in thousands)
Proved properties	$	12,337,372		$	10,259,226
Unproved properties		956,469	(1)		1,023,888	(1)
Total capitalized costs		13,293,841			11,283,114
Less:  Accumulated depreciation, depletion and amortization		7,481,335			6,774,174
Net capitalized costs	$	5,812,506		$	4,508,940

Schedule of Capitalized Costs of Unproved Properties Excluded from Amortization

	2013		2012		2011		Prior		Total
	(in thousands)
Property acquisition costs	$	147,791	$	81,889	$	221,451	$	109,994	$	561,125	(1)
Exploration and development costs		166,725		48,428		47,784		38,858		301,795	(1)
Capitalized interest		7,792		11,067		38,145		36,545		93,549	(1)
	$	322,308	$	141,384	$	307,380	$	185,397	$	956,469

Cost Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities Disclosure

	2013			2012			2011
	(in thousands, except per Mcfe amounts)
Proved property acquisition costs	$	572		$	–		$	17
Unproved property acquisition costs		168,404	(1)		220,822	(1)		262,886	(1)
Exploration costs		192,164	(2)		197,280	(2)		63,419	(2)
Development costs		1,662,138			1,492,841			1,633,784
Capitalized costs incurred		2,023,278			1,910,943			1,960,106
Full cost pool amortization per Mcfe	$	1.08		$	1.31		$	1.30

Results of Operations for Oil and Gas Producing Activities Disclosure

	2013		2012		2011
	(in thousands)
Sales	$	2,404,165	$	1,963,172	$	2,098,914
Production (lifting) costs		(628,817)		(505,271)		(469,153)
Depreciation, depletion and amortization		(735,215)		(765,192)		(666,107)
Impairment of natural gas and oil properties		–		(1,939,734)		–
		1,040,133		(1,247,025)		963,654
Provision (benefit) for income taxes		416,042		(496,738)		375,435
Results of operations (1)	$	624,091	$	(750,287)	$	588,219

Schedule of Proved Developed and Undeveloped Oil and Gas Reserve Quantities

	2013		2012		2011
	Natural		Natural		Natural
	Gas	Oil	Gas	Oil	Gas	Oil
	(MMcf)	(MBbls)	(MMcf)	(MBbls)	(MMcf)	(MBbls)
Proved reserves, beginning of year	4,016,798	244	5,887,207	996	4,929,980	1,219
Revisions of previous estimates	325,374	88	(2,087,985)	(44)	34,505	(125)
Extensions, discoveries and other additions	3,283,495	229	918,594	154	1,459,428	2
Production	(655,704)	(188)	(564,484)	(83)	(499,433)	(97)
Acquisition of reserves in place	4,114	–	–	–	13	–
Disposition of reserves in place	–	–	(136,534)	(779)	(37,286)	(3)
Proved reserves, end of year	6,974,077	373	4,016,798	244	5,887,207	996
Proved developed reserves:
Beginning of year	3,195,662	243	3,254,018	983	2,687,238	1,173
End of year	4,237,495	372	3,195,662	243	3,254,018	983
Proved undeveloped reserves:
Beginning of year	821,136	1	2,633,189	13	2,242,742	46
End of year	2,736,582	1	821,136	1	2,633,189	13

Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves Disclosure

	2013		2012		2011
	(in thousands)
Future cash inflows	$	22,624,562	$	9,570,652	$	22,012,205
Future production costs		(8,895,956)		(4,737,297)		(8,080,207)
Future development costs		(3,626,496)		(711,050)		(3,425,185)
Future income tax expense		(3,223,271)		(745,251)		(3,366,175)
Future net cash flows		6,878,839		3,377,054		7,140,638
10% annual discount for estimated timing of cash flows		(3,142,795)		(1,326,389)		(3,689,838)
Standardized measure of discounted future net cash flows	$	3,736,044	$	2,050,665	$	3,450,800

Schedule Of Analysis Of Changes In Standardized Measure

	2013		2012		2011
	(in thousands)
Standardized measure, beginning of year	$	2,050,665	$	3,450,800	$	3,013,750
Sales and transfers of natural gas and oil produced, net of production costs		(1,774,043)		(1,443,606)		(1,632,156)
Net changes in prices and production costs		1,852,772		(2,604,591)		(381,131)
Extensions, discoveries, and other additions, net of future production and development costs		1,454,634		549,601		1,163,992
Acquisition of reserves in place		4,914		–		30
Sales of reserves in place		–		(157,108)		(11,761)
Revisions of previous quantity estimates		348,996		(1,109,409)		34,221
Accretion of discount		232,385		480,315		426,245
Net change in income taxes		(1,119,798)		1,079,158		(103,643)
Changes in estimated future development costs		(196,394)		2,475,470		70,492
Previously estimated development costs incurred during the year		222,982		61,949		564,894
Changes in production rates (timing) and other		658,931		(731,914)		305,867
Standardized measure, end of year	$	3,736,044	$	2,050,665	$	3,450,800