Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Oil and natural gas sales
Oil	$ 18,955	$ 18,290	$ 62,150	$ 56,898
Natural gas	2,548	4,923	8,252	16,170
NGLs	2,644	3,250	7,582	10,461
Total oil and natural gas sales	24,147	26,463	77,984	83,529
Realized gains (losses) on derivatives	76	(1,213)	(1,186)	(2,818)
Unrealized gains on derivatives	22,744	1,782	18,519	6,136
Other	39	51	124	125
Total revenues and other operating income	47,006	27,083	95,441	86,972
OPERATING EXPENSES:
Oil and natural gas production taxes	1,391	1,518	4,280	4,565
Oil and natural gas production expenses	7,499	8,571	24,048	25,153
Depreciation and amortization	5,185	6,782	15,654	20,387
Accretion expense	409	452	1,223	1,288
Share-based compensation	872	813	2,227	2,284
General and administrative, overhead and other expenses, net of operator's overhead fees	3,100	2,932	10,913	10,694
Total operating expenses	18,456	21,068	58,345	64,371
Operating income	28,550	6,015	37,096	22,601
OTHER INCOME (EXPENSE):
Interest expense	(3,637)	(5,767)	(13,750)	(17,116)
Interest income	1	20	4	24
Loss on interest rate derivatives	(203)		(698)
Other income (expense)	181	(268)	(572)	293
INCOME BEFORE INCOME TAXES	24,892		22,080	5,802
INCOME TAX PROVISION (BENEFIT)	13,116	(1,564)	11,279	(909)
Net income	$ 11,776	$ 1,564	$ 10,801	$ 6,711
BASIC INCOME PER SHARE	$ 0.15	$ 0.02	$ 0.14	$ 0.09
BASIC WEIGHTED AVERAGE SHARES OUTSTANDING	79,086,261	78,633,535	78,762,799	78,361,299
DILUTED INCOME PER SHARE	$ 0.15	$ 0.02	$ 0.14	$ 0.09
DILUTED WEIGHTED AVERAGE SHARES OUTSTANDING	79,086,261	78,633,535	78,762,799	78,361,299