Consolidated Statements of Income and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net Operating Revenues
Crude Oil and Condensate	$ 2,397,102	$ 1,781,833
Natural Gas Liquids	246,235	169,529
Natural Gas	556,693	410,879
(Losses) Gains on Mark-to-Market Commodity Derivative Contracts	(155,736)	(104,956)
Gathering, Processing and Marketing	1,015,411	922,957
Gains on Asset Dispositions, Net	11,498	164,233
Other, Net	12,468	12,039
Total	4,083,671	3,356,514
Operating Expenses
Lease and Well	320,834	249,000
Transportation Costs	243,237	184,257
Gathering and Processing Costs	33,924	24,504
Exploration Costs	48,058	44,216
Dry Hole Costs	8,348	3,962
Impairments	113,361	53,548
Marketing Costs	1,006,304	904,649
Depreciation, Depletion and Amortization	946,491	846,388
General and Administrative	82,862	77,985
Taxes Other Than Income	195,973	134,931
Total	2,999,392	2,523,440
Operating Income	1,084,279	833,074
Other Income, Net	(3,338)	(10,134)
Income Before Interest Expense and Income Taxes	1,080,941	822,940
Interest Expense
Interest Expense, Net	50,152	61,921
Income Before Income Taxes	1,030,789	761,019
Income Tax Provision	369,861	266,294
Net Income	660,928	494,725
Net Income Per Share
Basic	$ 1.22	$ 0.92
Diluted	$ 1.21	$ 0.91
Dividends Declared per Common Share	$ 0.125	$ 0.09375
Average Number of Common Shares
Basic	542,278	538,717
Diluted	548,071	544,526
Comprehensive Income
Net Income	660,928	494,725
Other Comprehensive Income (Loss)
Foreign Currency Translation Adjustments	(12,930)	(14,264)
Foreign Currency Swap Transaction	50	1,701
Income Tax Related to Foreign Currency Swap Transaction	(670)	0
Interest Rate Swap Transaction	777	737
Income Tax Related to Interest Rate Swap Transaction	(281)	(265)
Other	23	28
Other Comprehensive Income (Loss)	(13,031)	(12,063)
Comprehensive Income	$ 647,897	$ 482,662