CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013		Sep. 30, 2014	Sep. 30, 2013
REVENUES
Sales and other operating revenues	$ 1,431,007	$ 1,366,434	[1]	$ 4,070,120	$ 3,980,960	[1]
Loss on sale of assets	(133)	(38)	[1]	(5,130)	(262)	[1]
Interest and other income	2,163	53,100	[1]	3,468	61,722	[1]
Total revenues	1,433,037	1,419,496	[1]	4,068,458	4,042,420	[1]
COSTS AND EXPENSES
Lease operating expenses	265,518	258,524	[1]	813,638	847,522	[1]
Severance and ad valorem taxes	28,574	22,393	[1]	83,793	57,790	[1]
Exploration expenses, including undeveloped lease amortization	117,433	147,845	[1]	390,711	345,110	[1]
Selling and general expenses	82,960	99,333	[1]	269,986	267,704	[1]
Depreciation, depletion and amortization	499,151	394,667	[1]	1,354,393	1,139,193	[1]
Impairment of assets					21,587	[1]
Accretion of asset retirement obligations	12,600	12,539	[1]	36,992	36,396	[1]
Interest expense	34,970	33,535	[1]	101,625	90,156	[1]
Interest capitalized	(5,323)	(13,011)	[1]	(19,244)	(40,877)	[1]
Other expense	662			1,297
Total costs and expenses	1,036,545	955,825	[1]	3,033,191	2,764,581	[1]
Income from continuing operations before income taxes	396,492	463,671	[1]	1,035,267	1,277,839	[1]
Income tax expense	125,435	198,593	[1]	452,255	570,189	[1]
Income from continuing operations	271,057	265,078	[1]	583,012	707,650	[1]
Income (loss) from discontinued operations, net of taxes	(25,350)	19,731	[1]	(52,639)	340,402	[1]
NET INCOME	$ 245,707	$ 284,809	[1]	$ 530,373	$ 1,048,052	[1]
PER COMMON SHARE - BASIC
Income from continuing operations	$ 1.52	$ 1.42	[1]	$ 3.25	$ 3.75	[1]
Income (loss) from discontinued operations	$ (0.14)	$ 0.10	[1]	$ (0.29)	$ 1.80	[1]
Net income	$ 1.38	$ 1.52	[1]	$ 2.96	$ 5.55	[1]
PER COMMON SHARE - DILUTED
Income from continuing operations	$ 1.51	$ 1.41	[1]	$ 3.23	$ 3.72	[1]
Income (loss) from discontinued operations	$ (0.14)	$ 0.10	[1]	$ (0.29)	$ 1.79	[1]
Net income	$ 1.37	$ 1.51	[1]	$ 2.94	$ 5.51	[1]
Average Common shares outstanding
Basic	177,535,503	186,938,328	[1]	179,259,573	188,914,000	[1]
Diluted	178,856,078	188,337,511	[1]	180,578,085	190,245,166	[1]

[1] Reclassified to conform to current presentation - See Note D.