Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Oil and natural gas sales
Oil	$ 22,783	$ 19,120	$ 43,195	$ 38,608
Natural gas	2,812	4,818	5,704	11,247
NGLs	2,523	3,280	4,938	7,211
Total oil and natural gas sales	28,118	27,218	53,837	57,066
Realized losses on derivatives	(2,098)	(707)	(1,262)	(1,605)
Unrealized gains (losses) on derivatives	10,728	2,419	(4,225)	4,354
Other	34	38	85	74
Total revenues and other operating income	36,782	28,968	48,435	59,889
OPERATING EXPENSES:
Oil and natural gas production taxes	1,478	1,453	2,889	3,047
Oil and natural gas production expenses	8,174	8,662	16,549	16,582
Depreciation and amortization	5,196	6,891	10,469	13,605
Accretion expense	412	454	814	836
Share-based compensation	686	785	1,355	1,471
General and administrative, overhead and other expenses, net of operator's overhead fees	3,935	3,992	7,813	7,762
Total operating expenses	19,881	22,237	39,889	43,303
Operating income	16,901	6,731	8,546	16,586
OTHER INCOME (EXPENSE):
Interest expense	(3,563)	(5,714)	(10,113)	(11,349)
Interest income	3	2	3	4
Loss on interest rate derivatives	(362)		(495)
Other income (expense)	(801)	570	(753)	561
INCOME (LOSS) BEFORE INCOME TAXES	12,178	1,589	(2,812)	5,802
INCOME TAX PROVISION (BENEFIT)	3,242	(1,140)	(1,837)	655
Net income (loss)	$ 8,936	$ 2,729	$ (975)	$ 5,147
BASIC INCOME (LOSS) PER SHARE	$ 0.11	$ 0.03	$ (0.01)	$ 0.07
BASIC WEIGHTED AVERAGE SHARES OUTSTANDING	78,834,159	78,446,305	78,598,387	78,222,925
DILUTED INCOME (LOSS) PER SHARE	$ 0.11	$ 0.03	$ (0.01)	$ 0.07
DILUTED WEIGHTED AVERAGE SHARES OUTSTANDING	78,834,159	78,446,305	78,598,387	78,222,925