Consolidated Statements of Income (Loss) and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net Operating Revenues
Crude Oil and Condensate	$ 1,430,061	$ 753,711
Natural Gas Liquids	153,444	75,319
Natural Gas	230,602	165,503
Gains on Mark-to-Market Commodity Derivative Contracts	62,020	5,435
Gathering, Processing and Marketing	726,537	333,953
Gains (Losses) on Asset Dispositions, Net	(16,758)	9,147
Other, Net	24,659	11,281
Total	2,610,565	1,354,349
Operating Expenses
Lease and Well	255,777	240,865
Transportation Costs	178,714	190,454
Gathering and Processing Costs	38,144	28,524
Exploration Costs	56,894	29,829
Dry Hole Costs	0	246
Impairments	193,187	71,617
Marketing Costs	736,536	340,854
Depreciation, Depletion and Amortization	816,036	928,891
General and Administrative	97,238	100,531
Taxes Other Than Income	130,293	60,679
Total	2,502,819	1,992,490
Operating Income (Loss)	107,746	(638,141)
Other Income (Expense), Net	3,151	(4,437)
Income (Loss) Before Interest Expense and Income Taxes	110,897	(642,578)
Interest Expense
Interest Expense, Net	71,515	68,390
Income (Loss) Before Income Taxes	39,382	(710,968)
Income Tax Provision (Benefit)	10,865	(239,192)
Net Income (Loss)	$ 28,517	$ (471,776)
Net Income (Loss) Per Share
Basic	$ 0.05	$ (0.86)
Diluted	0.05	(0.86)
Dividends Declared per Common Share	$ 0.1675	$ 0.1675
Average Number of Common Shares
Basic	573,935	546,715
Diluted	578,593	546,715
Other Comprehensive Income
Foreign Currency Translation Adjustments	$ 309	$ 2,185
Other, Net of Tax	37	22
Other Comprehensive Income	346	2,207
Comprehensive Income (Loss)	$ 28,863	$ (469,569)