Consolidated Statements of Income and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net Operating Revenues
Crude Oil and Condensate	$ 1,781,833	$ 1,310,335
Natural Gas Liquids	169,529	198,310
Natural Gas	410,879	367,284
(Losses) Gains on Mark-to-Market Commodity Derivative Contracts	(104,956)	134,208
Gathering, Processing and Marketing	922,957	718,157
Gains on Asset Dispositions, Net	164,233	67,468
Other, Net	12,039	10,889
Total	3,356,514	2,806,651
Operating Expenses
Lease and Well	249,000	261,495
Transportation Costs	184,257	131,842
Gathering and Processing Costs	24,504	25,592
Exploration Costs	44,216	42,807
Dry Hole Costs	3,962	0
Impairments	53,548	133,147
Marketing Costs	904,649	705,468
Depreciation, Depletion and Amortization	846,388	748,743
General and Administrative	77,985	76,269
Taxes Other Than Income	134,931	121,516
Total	2,523,440	2,246,879
Operating Income	833,074	559,772
Other Income (Expense), Net	(10,134)	10,631
Income Before Interest Expense and Income Taxes	822,940	570,403
Interest Expense
Interest Expense, Net	61,921	50,269
Income Before Income Taxes	761,019	520,134
Income Tax Provision	266,294	196,125
Net Income	494,725	324,009
Net Income Per Share
Basic	$ 1.84	$ 1.22
Diluted	$ 1.82	$ 1.20
Dividends Declared per Common Share	$ 0.1875	$ 0.17
Average Number of Common Shares
Basic	269,358	266,674
Diluted	272,263	270,242
Comprehensive Income
Net Income	494,725	324,009
Other Comprehensive Income (Loss)
Foreign Currency Translation Adjustments	(14,264)	26,525
Foreign Currency Swap Transaction	(1,701)	(2,061)
Income Tax Related to Foreign Currency Swap Transaction	0	(527)
Interest Rate Swap Transaction	(737)	595
Income Tax Related to Interest Rate Swap Transaction	(265)	214
Other	(28)	(27)
Other Comprehensive Income (Loss)	(12,063)	27,705
Comprehensive Income	$ (482,662)	$ (351,714)