Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues and other income
Oil, natural gas, and related product sales	$ 657,029	$ 638,188	$ 1,280,875	$ 1,211,841
CO2 and helium sales and transportation fees	11,822	6,562	22,583	13,120
Interest income and other income	3,269	5,334	10,406	8,209
Total revenues and other income	672,120	650,084	1,313,864	1,233,170
Expenses
Lease operating expenses	163,250	220,558	333,629	361,100
Marketing and plant operating expenses	18,149	13,332	34,935	23,128
CO2 and helium discovery and operating expenses	5,590	3,419	10,795	7,141
Taxes other than income	50,850	44,940	96,795	82,951
General and administrative expenses	38,952	33,382	82,645	75,271
Interest, net of amounts capitalized of $5,795, $23,279, $11,551, and $44,984, respectively	46,550	30,602	95,384	66,636
Depletion, depreciation, and amortization	148,164	126,907	289,294	239,805
Commodity derivative expense (income)	174,771	(45,501)	251,440	(33,572)
Loss on early extinguishment of debt	113,908	428	113,908	44,651
Other expenses	0	10,711	0	12,818
Total expenses	760,184	438,778	1,308,825	879,929
Income (loss) before income taxes	(88,064)	211,306	5,039	353,241
Income tax provision (benefit)	(32,864)	81,326	1,929	135,690
Net income (loss)	$ (55,200)	$ 129,980	$ 3,110	$ 217,551
Net income (loss) per common share
Basic	$ (0.16)	$ 0.35	$ 0.01	$ 0.59
Diluted	$ (0.16)	$ 0.35	$ 0.01	$ 0.58
Dividends per common share	$ 0.0625	$ 0	$ 0.1250	$ 0
Weighted average common shares outstanding
Basic	347,803	368,850	349,267	369,122
Diluted	347,803	371,969	351,566	372,417