Consolidated Statements Of Operations - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues and other income:
Oil and gas	$ 557,000	$ 967,000	$ 1,670,000	$ 2,795,000
Sales of purchased oil and gas	326,000	202,000	665,000	554,000
Interest and other	(17,000)	2,000	0	9,000
Derivative gains, net	573,000	341,000	617,000	19,000
Gain (loss) on disposition of assets, net	779,000	1,000	782,000	11,000
Total revenues and other income	2,218,000	1,513,000	3,734,000	3,388,000
Costs and expenses:
Oil and gas production	189,000	168,000	532,000	493,000
Production and ad valorem taxes	36,000	58,000	112,000	169,000
Depletion, depreciation and amortization	364,000	274,000	1,003,000	734,000
Purchased oil and gas	339,000	194,000	684,000	535,000
Impairment of oil and gas properties	72,000	0	210,000	0
Exploration and abandonments	25,000	22,000	79,000	80,000
General and administrative	81,000	81,000	246,000	244,000
Accretion of discount on asset retirement obligations	3,000	3,000	9,000	9,000
Interest	46,000	46,000	138,000	138,000
Other	60,000	20,000	170,000	55,000
Costs and Expenses	1,215,000	866,000	3,183,000	2,457,000
Income from continuing operations before income taxes	1,003,000	647,000	551,000	931,000
Income tax provision	(355,000)	(236,000)	(195,000)	(319,000)
Income from continuing operations	648,000	411,000	356,000	612,000
Loss from discontinued operations, net of tax	(2,000)	(37,000)	(6,000)	(113,000)
Net income			350,000	499,000
Net income (loss) attributable to common stockholders	$ 646,000	$ 374,000	$ 350,000	$ 499,000
Basic earnings per share:
Income from continuing operations	$ 4.29	$ 2.84	$ 2.36	$ 4.24
Loss from discontinued operations	(0.01)	(0.26)	(0.04)	(0.79)
Net income	4.28	2.58	2.32	3.45
Diluted earnings per share:
Income from continuing operations	4.28	2.84	2.36	4.23
Loss from discontinued operations	(0.01)	(0.26)	(0.04)	(0.79)
Net income	$ 4.27	$ 2.58	$ 2.32	$ 3.44
Weighted average shares outstanding:
Basic	149	143	149	143
Diluted	150	143	149	143
Dividends declared per share	$ 0.04	$ 0.04	$ 0.08	$ 0.08
Amounts attributable to common stockholders:
Net income (loss) attributable to common stockholders	$ 646,000	$ 374,000	$ 350,000	$ 499,000