Consolidated Statements Of Operations - USD ($) $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues and other income:
Oil and gas	$ 596,000	$ 938,000	$ 1,113,000	$ 1,828,000
Sales of purchased oil and gas	236,000	205,000	339,000	353,000
Interest and other	11,000	3,000	17,000	7,000
Derivative gains (losses), net	(197,000)	(218,000)	44,000	(322,000)
Gain (loss) on disposition of assets, net	2,000	4,000	3,000	10,000
Total revenues and other income	648,000	932,000	1,516,000	1,876,000
Costs and expenses:
Oil and gas production	163,000	167,000	343,000	325,000
Production and ad valorem taxes	37,000	56,000	76,000	111,000
Depletion, depreciation and amortization	329,000	243,000	639,000	460,000
Purchased oil and gas	237,000	198,000	345,000	341,000
Impairment of oil and gas properties	0	0	138,000	0
Exploration and abandonments	28,000	28,000	54,000	59,000
General and administrative	83,000	82,000	165,000	163,000
Accretion of discount on asset retirement obligations	3,000	3,000	6,000	6,000
Interest	46,000	47,000	92,000	92,000
Other	62,000	21,000	110,000	36,000
Costs and Expenses	988,000	845,000	1,968,000	1,593,000
Income (loss) from continuing operations before income taxes	(340,000)	87,000	(452,000)	283,000
Income tax benefit (provision)	123,000	(32,000)	160,000	(83,000)
Income (loss) from continuing operations	(217,000)	55,000	(292,000)	200,000
Loss from discontinued operations, net of tax	(1,000)	(54,000)	(4,000)	(76,000)
Net income (loss)			(296,000)	124,000
Net income (loss) attributable to common stockholders	$ (218,000)	$ 1,000	$ (296,000)	$ 124,000
Basic earnings per share:
Income (loss) from continuing operations	$ (1.45)	$ 0.38	$ (1.95)	$ 1.38
Loss from discontinued operations	(0.01)	(0.37)	(0.03)	(0.52)
Net income (loss)	(1.46)	0.01	(1.98)	0.86
Diluted earnings per share:
Income (loss) from continuing operations	(1.45)	0.38	(1.95)	1.38
Loss from discontinued operations	(0.01)	(0.37)	(0.03)	(0.52)
Net income (loss)	$ (1.46)	$ 0.01	$ (1.98)	$ 0.86
Weighted average shares outstanding:
Basic and diluted weighted average shares outstanding	149	143	149	143
Diluted	149	143	149	143
Dividends declared per share	$ 0.00	$ 0.00	$ 0.04	$ 0.04
Amounts attributable to common stockholders:
Net income (loss) attributable to common stockholders	$ (218,000)	$ 1,000	$ (296,000)	$ 124,000