CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues and other
Oil, natural gas and natural gas liquids sales	$ 292,482	$ 177,306	$ 835,579	$ 479,887
Gains on oil and natural gas derivatives	824,240	43,505	660,279	263,299
Marketing revenues	1,477	635	4,159	3,252
Other revenues	1,284	915	3,564	1,363
Total revenues	1,119,483	222,361	1,503,581	747,801
Expenses
Lease operating expenses	62,907	41,901	165,171	111,490
Transportation expenses	7,821	5,154	20,152	15,030
Marketing expenses	850	468	2,703	2,209
General and administrative expenses	29,891	23,751	91,994	71,545
Exploration costs	503	281	1,498	4,297
Bad debt expenses	79	(70)	74	(89)
Depreciation, depletion and amortization	88,328	62,482	234,039	169,614
Taxes, other than income taxes	20,875	12,011	56,920	32,602
Losses on sale of assets and other, net	279	6,073	1,870	5,699
Total expenses	211,533	152,051	574,421	412,397
Other income and (expenses)
Loss on extinguishment of debt	0	0	(94,372)	0
Interest expense, net of amounts capitalized	(65,848)	(53,497)	(191,673)	(127,119)
Losses on interest rate swaps	0	(11,501)	0	(67,908)
Other, net	(1,613)	(1,136)	(6,331)	(5,428)
Total other income and (expenses)	(67,461)	(66,134)	(292,376)	(200,455)
Income before income taxes	840,489	4,176	636,784	134,949
Income tax expense	(2,862)	(33)	(8,730)	(5,710)
Net income	$ 837,627	$ 4,143	$ 628,054	$ 129,239
Net income per unit
Basic	$ 4.74	$ 0.03	$ 3.63	$ 0.91
Diluted	$ 4.72	$ 0.03	$ 3.62	$ 0.91
Weighted average units outstanding
Basic	174,956	145,956	171,076	140,598
Diluted	175,644	146,458	171,825	141,006
Distributions declared per unit	$ 0.69	$ 0.63	$ 2.01	$ 1.89