Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net Operating Revenues
Crude Oil and Condensate	$ 1,137,717	$ 1,181,092	$ 2,951,118	$ 3,894,092
Natural Gas Liquids	112,439	95,217	299,401	311,137
Natural Gas	205,293	281,837	526,779	843,657
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts	5,117	29,239	(33,821)	56,954
Gathering, Processing and Marketing	532,456	572,217	1,351,665	1,820,843
Gains (Losses) on Asset Dispositions, Net	108,204	(1,185)	101,801	(5,142)
Other, Net	17,278	14,011	51,650	39,126
Total	2,118,504	2,172,428	5,248,593	6,960,667
Operating Expenses
Lease and Well	226,348	283,221	685,606	934,366
Transportation Costs	200,862	203,594	570,787	641,739
Gathering and Processing Costs	32,635	35,497	90,385	106,503
Exploration Costs	25,455	31,344	85,843	114,548
Dry Hole Costs	10,390	198	10,464	14,317
Impairments	177,990	6,307,420	322,321	6,445,375
Marketing Costs	552,487	615,303	1,373,387	1,924,134
Depreciation, Depletion and Amortization	899,511	722,172	2,690,893	2,544,187
General and Administrative	94,397	90,959	292,633	257,580
Taxes Other Than Income	91,909	105,677	246,068	334,244
Total	2,311,984	8,395,385	6,368,387	13,316,993
Operating Loss	(193,480)	(6,222,957)	(1,119,794)	(6,356,326)
Other (Expense) Income, Net	(7,912)	8,607	(33,345)	7,996
Loss Before Interest Expense and Income Taxes	(201,392)	(6,214,350)	(1,153,139)	(6,348,330)
Interest Expense
Interest Expense, Net	70,858	60,571	210,356	174,400
Loss Before Income Taxes	(272,250)	(6,274,921)	(1,363,495)	(6,522,730)
Income Tax Benefit	(82,250)	(2,199,182)	(409,161)	(2,282,511)
Net Loss	$ (190,000)	$ (4,075,739)	$ (954,334)	$ (4,240,219)
Net Loss Per Share
Basic	$ (0.35)	$ (7.47)	$ (1.74)	$ (7.77)
Diluted	(0.35)	(7.47)	(1.74)	(7.77)
Dividends Declared per Common Share	$ 0.1675	$ 0.1675	$ 0.5025	$ 0.5025
Average Number of Common Shares
Basic	547,838	545,920	547,295	545,466
Diluted	547,838	545,920	547,295	545,466
Comprehensive Income (Loss)
Net Loss	$ (190,000)	$ (4,075,739)	$ (954,334)	$ (4,240,219)
Other Comprehensive Income (Loss)
Foreign Currency Translation Adjustments	141	(7,004)	8,170	(11,767)
Other	23	28	68	(156)
Other Comprehensive Income (Loss)	164	(6,976)	8,238	(11,923)
Comprehensive Loss	$ (189,836)	$ (4,082,715)	$ (946,096)	$ (4,252,142)