Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating Revenues and Other
Crude Oil and Condensate	$ 2,377,528	$ 1,445,454	$ 4,478,836	$ 2,875,515
Natural Gas Liquids	286,354	146,907	507,769	300,351
Natural Gas	300,845	224,008	600,611	454,610
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts	(185,883)	9,446	(245,654)	71,466
Gathering, Processing and Marketing	1,436,436	778,797	2,538,258	1,505,334
Losses on Asset Dispositions, Net	(6,317)	(8,916)	(21,286)	(25,674)
Other, Net	29,114	16,776	60,705	41,435
Total	4,238,077	2,612,472	7,919,239	5,223,037
Operating Expenses
Lease and Well	314,604	255,186	614,668	510,963
Transportation Costs	177,797	186,356	354,754	365,070
Gathering and Processing Costs	109,169	34,746	210,514	72,890
Exploration Costs	47,478	34,711	82,314	91,605
Dry Hole Costs	4,902	27	4,902	27
Impairments	51,708	78,934	116,317	272,121
Marketing Costs	1,420,463	790,599	2,526,853	1,527,135
Depreciation, Depletion and Amortization	848,674	865,384	1,597,265	1,681,420
General and Administrative	104,083	108,507	198,781	205,745
Taxes Other Than Income	194,268	130,114	373,352	260,407
Total	3,273,146	2,484,564	6,079,720	4,987,383
Operating Income	964,931	127,908	1,839,519	235,654
Other Income (Expense), Net	(8,551)	4,972	(7,824)	8,123
Income Before Interest Expense and Income Taxes	956,380	132,880	1,831,695	243,777
Interest Expense
Interest Expense, Net	63,444	70,413	125,400	141,928
Income Before Income Taxes	892,936	62,467	1,706,295	101,849
Income Tax Provision	196,205	39,414	370,975	50,279
Net Income	$ 696,731	$ 23,053	$ 1,335,320	$ 51,570
Net Income Per Share
Basic	$ 1.21	$ 0.04	$ 2.32	$ 0.09
Diluted	1.20	0.04	2.30	0.09
Dividends Declared per Common Share	$ 0.1850	$ 0.1675	$ 0.3700	$ 0.3350
Average Number of Common Shares
Basic	576,135	574,439	575,953	574,162
Diluted	580,375	578,483	580,007	578,573
Other Comprehensive Income (Loss)
Foreign Currency Translation Adjustments	$ (3,229)	$ 1,260	$ 1,773	$ 1,569
Other, Net of Tax	6	(86)	12	(49)
Other Comprehensive Income (Loss)	(3,223)	1,174	1,785	1,520
Comprehensive Income	$ 693,508	$ 24,227	$ 1,337,105	$ 53,090