Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Operating Revenues
Crude Oil and Condensate	$ 753,711	$ 1,260,244
Natural Gas Liquids	75,319	111,990
Natural Gas	165,503	287,782
Gains on Mark-to-Market Commodity Derivative Contracts	5,435	76,208
Gathering, Processing and Marketing	333,953	570,270
Gains on Asset Dispositions, Net	9,147	1,607
Other, Net	11,281	10,437
Total	1,354,349	2,318,538
Operating Expenses
Lease and Well	240,865	361,481
Transportation Costs	190,454	228,312
Gathering and Processing Costs	28,524	36,009
Exploration Costs	29,829	39,449
Dry Hole Costs	246	14,670
Impairments	71,617	69,436
Marketing Costs	340,854	638,662
Depreciation, Depletion and Amortization	928,891	912,788
General and Administrative	100,531	84,297
Taxes Other Than Income	60,679	106,429
Total	1,992,490	2,491,533
Operating Loss	(638,141)	(172,995)
Other Expense, Net	(4,437)	(9,991)
Loss Before Interest Expense and Income Taxes	(642,578)	(182,986)
Interest Expense
Interest Expense, Net	68,390	53,345
Loss Before Income Taxes	(710,968)	(236,331)
Income Tax Benefit	(239,192)	(66,583)
Net Loss	$ (471,776)	$ (169,748)
Net Loss Per Share
Basic	$ (0.86)	$ (0.31)
Diluted	(0.86)	(0.31)
Dividends Declared per Common Share	$ 0.1675	$ 0.1675
Average Number of Common Shares
Basic	546,715	544,998
Diluted	546,715	544,998
Comprehensive Income (Loss)
Net Loss	$ (471,776)	$ (169,748)
Other Comprehensive Income (Loss)
Foreign Currency Translation Adjustments	2,185	(13,167)
Other	22	(211)
Other Comprehensive Income (Loss)	2,207	(13,378)
Comprehensive Loss	$ (469,569)	$ (183,126)