Consolidated Statements of Operations (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
Consolidated Statements of Operations
OIL AND GAS REVENUES	$ 50,672	$ 32,922	$ 94,730	$ 71,878
COSTS AND EXPENSES
Lease operating	7,427	6,166	14,093	11,243
Production tax	1,466	885	2,407	1,790
Ad valorem tax	981	468	1,672	1,672
Depreciation, depletion and amortization	20,595	11,079	37,271	20,920
Impairment of oil and gas properties		2,731		2,731
General and administrative (inclusive of stock-based compensation expense of $6,805 and $3,156 for the three months ended June 30, 2011 and 2010, respectively, and $10,655 and $5,320 for the six months ended June 30, 2011 and 2010, respectively)	14,094	7,750	23,339	14,686
Accretion related to asset retirement obligations	71	53	145	104
TOTAL COSTS AND EXPENSES	44,634	29,132	78,927	53,146
OPERATING INCOME	6,038	3,790	15,803	18,732
OTHER INCOME AND EXPENSES:
Gain (loss) on derivative instruments, net	12,065	3,214	11,878	26,016
Loss on extinguishment of debt			(897)
Interest expense	(12,407)	(9,845)	(24,615)	(19,655)
Capitalized interest	5,649	4,992	10,909	9,461
Other income (expense), net	(1)	(51)	61	(21)
INCOME BEFORE INCOME TAXES	11,344	2,100	13,139	34,533
INCOME TAX EXPENSE	(3,602)	(315)	(4,662)	(13,012)
NET INCOME	7,742	1,785	8,477	21,521
OTHER COMPREHENSIVE INCOME, NET OF INCOME TAXES
Increase in market value of investment in Pinnacle Gas Resources, Inc., net of income taxes		15
COMPREHENSIVE INCOME	$ 7,742	$ 1,800	$ 8,477	$ 21,521
NET INCOME PER COMMON SHARE
BASIC	$ 0.20	$ 0.05	$ 0.22	$ 0.66
DILUTED	$ 0.20	$ 0.05	$ 0.21	$ 0.65
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
BASIC	38,898	34,060	38,841	32,574
DILUTED	39,497	34,464	39,450	33,022