Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Revenues and Other
Crude Oil and Condensate	$ 2,101,308	$ 1,430,061
Natural Gas Liquids	221,415	153,444
Natural Gas	299,766	230,602
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts	(59,771)	62,020
Gathering, Processing and Marketing	1,101,822	726,537
Losses on Asset Dispositions, Net	(14,969)	(16,758)
Other, Net	31,591	24,659
Total	3,681,162	2,610,565
Operating Expenses
Lease and Well	300,064	255,777
Transportation Costs	176,957	178,714
Gathering and Processing Costs	101,345	38,144
Exploration Costs	34,836	56,894
Impairments	64,609	193,187
Marketing Costs	1,106,390	736,536
Depreciation, Depletion and Amortization	748,591	816,036
General and Administrative	94,698	97,238
Taxes Other Than Income	179,084	130,293
Total	2,806,574	2,502,819
Operating Income	874,588	107,746
Other Income, Net	727	3,151
Income Before Interest Expense and Income Taxes	875,315	110,897
Interest Expense
Interest Expense, Net	61,956	71,515
Income Before Income Taxes	813,359	39,382
Income Tax Provision	174,770	10,865
Net Income	$ 638,589	$ 28,517
Net Income Per Share
Basic	$ 1.11	$ 0.05
Diluted	1.10	0.05
Dividends Declared per Common Share	$ 0.1850	$ 0.1675
Average Number of Common Shares
Basic	575,775	573,935
Diluted	579,726	578,593
Other Comprehensive Income
Foreign Currency Translation Adjustments	$ 5,002	$ 309
Other, Net of Tax	6	37
Other Comprehensive Income	5,008	346
Comprehensive Income	$ 643,597	$ 28,863