Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenue:
Oil	$ 53,892	$ 35,735	$ 102,438	$ 71,592
Gas	5,238	4,069	10,043	8,611
Other	778	838	1,483	1,571
Total revenue	59,908	40,642	113,964	81,774
Operating expenses:
Lease operating	13,526	12,192	27,912	25,414
Production and ad valorem taxes	8,233	5,810	16,025	12,136
Depletion, depreciation, amortization and asset retirement obligation accretion	13,692	11,220	26,660	21,933
General and administrative	4,753	3,834	9,106	6,487
Total operating expenses	40,204	33,056	79,703	65,970
Income from operations	19,704	7,586	34,261	15,804
Other income (expense):
Interest expense, net	(772)	(1,275)	(1,887)	(2,347)
Realized and unrealized gains (losses) on derivative instruments	21,644	24,226	(18,331)	24,436
Other income	18	14	52	47
Total other income (expense)	20,890	22,965	(20,166)	22,136
Income before income taxes	40,594	30,551	14,095	37,940
Income tax expense	(14,926)	(11,483)	(5,201)	(14,168)
Net income	$ 25,668	$ 19,068	$ 8,894	$ 23,772
Net income per common share:
Basic	$ 0.44	$ 0.38	$ 0.16	$ 0.48
Diluted	$ 0.37	$ 0.38	$ 0.13	$ 0.47
Weighted average common shares outstanding:
Basic	58,883	49,905	56,059	49,905
Diluted	70,154	50,526	67,713	50,820