CONSOLIDATED STATEMENTS OF INCOME (unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
REVENUES
Sales and other operating revenues	$ 1,281,208	$ 1,298,928	[1]
Interest and other income (loss)	5,192	(7,990)	[1]
Total revenues	1,286,400	1,290,938	[1]
COSTS AND EXPENSES
Lease operating expenses	262,255	337,223	[1]
Severance and ad valorem taxes	26,326	15,063	[1]
Exploration expenses, including undeveloped lease amortization	138,466	108,493	[1]
Selling and general expenses	92,026	81,467	[1]
Depreciation, depletion and amortization	396,249	363,142	[1]
Accretion of asset retirement obligations	12,065	11,896	[1]
Interest expense	32,886	27,028	[1]
Interest capitalized	(8,868)	(13,388)	[1]
Other expense	814	0	[1]
Total costs and expenses	952,219	930,924	[1]
Income from continuing operations before income taxes	334,181	360,014	[1]
Income tax expense	164,895	177,331	[1]
Income from continuing operations	169,286	182,683	[1]
Income (loss) from discontinued operations, net of taxes	(14,033)	177,916	[1]
NET INCOME	$ 155,253	$ 360,599	[1]
INCOME PER COMMON SHARE - BASIC
Income from continuing operations	$ 0.94	$ 0.96	[1]
Income (loss) from discontinued operations	$ (0.08)	$ 0.93	[1]
Net income	$ 0.86	$ 1.89	[1]
INCOME PER COMMON SHARE - DILUTED
Income from continuing operations	$ 0.93	$ 0.95	[1]
Income (loss) from discontinued operations	$ (0.08)	$ 0.93	[1]
Net income	$ 0.85	$ 1.88	[1]
Average Common shares outstanding
Basic	181,367,565	190,810,201	[1]
Diluted	182,576,570	191,765,395	[1]

[1] Reclassified to conform to current presentation.