Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues:
Natural gas, NGL and crude oil sales	$ 56,879	$ 65,762	$ 132,189	$ 124,572
Sales from natural gas marketing	8,917	18,897	20,751	34,099
Commodity price risk management gain (loss), net	38,729	20,537	50,230	(3,345)
Well operations, pipeline income and other	1,520	1,755	3,221	3,598
Total revenues	106,045	106,951	206,391	158,924
Costs, expenses and other:
Production costs	18,880	16,895	38,069	35,367
Cost of natural gas marketing	8,761	18,207	20,253	33,200
Exploration expense	2,570	1,215	4,633	2,884
Impairment of natural gas and crude oil properties	370	499	1,023	952
General and administrative expense	14,378	19,509	29,086	33,382
Depreciation, depletion and amortization	34,448	30,592	74,262	61,577
Gain on sale of properties and equipment	(2,246)	0	(2,400)	0
Total costs, expenses and other	77,161	86,917	164,926	167,362
Income (loss) from operations	28,884	20,034	41,465	(8,438)
Interest income	0	2	2	11
Interest expense	(10,053)	(9,067)	(20,497)	(18,129)
Income (loss) from continuing operations before income taxes	18,831	10,969	20,970	(26,556)
Provision for income taxes	6,179	2,804	6,938	(11,474)
Income (loss) from continuing operations	12,652	8,165	14,032	(15,082)
Income (loss) from discontinued operations, net of tax	(381)	1,000	14,074	4,323
Net Income (Loss)	$ 12,271	$ 9,165	$ 28,106	$ (10,759)
Basic
Income (loss) from continuing operations	$ 0.48	$ 0.35	$ 0.56	$ (0.64)
Income (loss) from discontinued operations	$ (0.02)	$ 0.04	$ 0.56	$ 0.18
Net income (loss)	$ 0.46	$ 0.39	$ 1.12	$ (0.46)
Diluted
Income (loss) from continuing operations	$ 0.47	$ 0.35	$ 0.55	$ (0.64)
Income (loss) from discontinued operations	$ (0.01)	$ 0.04	$ 0.56	$ 0.18
Net income (loss)	$ 0.46	$ 0.39	$ 1.11	$ (0.46)
Weighted average common shares outstanding
Basic	26,597	23,491	25,103	23,460
Diluted	26,728	23,723	25,268	23,460