Consolidated Statements of Income and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net Operating Revenues
Crude Oil and Condensate	$ 1,310,335	$ 757,362
Natural Gas Liquids	198,310	148,727
Natural Gas	367,284	583,919
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts	134,208	(66,746)
Gathering, Processing and Marketing	718,157	395,583
Gains on Asset Dispositions, Net	67,468	71,742
Other, Net	10,889	6,519
Total	2,806,651	1,897,106
Operating Expenses
Lease and Well	261,495	215,089
Transportation Costs	131,842	97,633
Gathering and Processing Costs	25,592	19,196
Exploration Costs	42,807	50,909
Dry Hole Costs	0	22,951
Impairments	133,147	89,328
Marketing Costs	705,468	385,409
Depreciation, Depletion and Amortization	748,743	568,226
General and Administrative	76,269	70,037
Taxes Other Than Income	121,516	105,877
Total	2,246,879	1,624,655
Operating Income	559,772	272,451
Other Income, Net	10,631	3,604
Income Before Interest Expense and Income Taxes	570,403	276,055
Interest Expense
Interest Expense, Net	50,269	50,333
Income Before Income Taxes	520,134	225,722
Income Tax Provision	196,125	91,749
Net Income	324,009	133,973
Net Income Per Share Available to Common Stockholders
Basic	$ 1.22	$ 0.52
Diluted	$ 1.20	$ 0.52
Dividends Declared per Common Share	$ 0.17	$ 0.16
Average Number of Common Shares
Basic	266,674	255,200
Diluted	270,242	258,819
Quarterly cash dividend	$ 0.17	$ 0.16
Comprehensive Income
Net Income	324,009	133,973
Other Comprehensive Income (Loss)
Foreign Currency Translation Adjustments	26,525	43,842
Foreign Currency Swap	2,061	659
Income Tax Related to Foreign Currency Swap	(527)	(164)
Interest Rate Swap	(595)	1,604
Income Tax Related to Interest Rate Swap	214	(578)
Other	27	30
Other Comprehensive Income	27,705	45,393
Comprehensive Income	$ 351,714	$ 179,366