Consolidated Statements of Income (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net Operating Revenues
Crude Oil and Condensate	$ 938,518	$ 455,808	$ 1,695,880	$ 861,970
Natural Gas Liquids	183,805	104,241	332,532	207,268
Natural Gas	599,993	553,354	1,183,912	1,230,336
Gains on Mark-to-Market Commodity Derivative Contracts	189,621	37,015	122,875	44,818
Gathering, Processing and Marketing	487,698	195,876	883,281	367,819
Gains on Asset Dispositions, Net	163,771	8,307	235,513	7,632
Other, Net	6,844	3,367	13,363	8,818
Total	2,570,250	1,357,968	4,467,356	2,728,661
Operating Expenses
Lease and Well	216,695	160,734	431,784	326,726
Transportation Costs	101,965	94,345	199,598	183,056
Gathering and Processing Costs	17,716	13,220	36,912	28,881
Exploration Costs	41,238	50,131	92,147	101,328
Dry Hole Costs	1,676	19,318	24,627	42,395
Impairments	358,654	80,362	447,982	149,957
Marketing Costs	469,437	191,213	854,846	359,977
Depreciation, Depletion and Amortization	602,944	465,343	1,171,170	897,249
General and Administrative	67,406	64,737	137,443	125,160
Taxes Other Than Income	104,266	78,064	210,143	153,529
Total	1,981,997	1,217,467	3,606,652	2,368,258
Operating Income	588,253	140,501	860,704	360,403
Other Income (Expense), Net	6,224	(545)	9,828	2,138
Income Before Interest Expense and Income Taxes	594,477	139,956	870,532	362,541
Interest Expense, Net	51,253	29,897	101,586	55,325
Income Before Income Taxes	543,224	110,059	768,946	307,216
Income Tax Provision	247,650	50,187	339,399	129,329
Net Income	$ 295,574	$ 59,872	$ 429,547	$ 177,887
Net Income Per Share
Basic	$ 1.11	$ 0.24	$ 1.65	$ 0.71
Diluted	$ 1.10	$ 0.24	$ 1.63	$ 0.70
Dividends Declared per Common Share	$ 0.160	$ 0.155	$ 0.320	$ 0.310
Average Number of Common Shares
Basic	265,830	250,825	259,766	250,596
Diluted	269,332	254,503	263,363	254,206

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