Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues:
Oil and gas sales	$ 554,194	$ 602,341	$ 436,632
Price-risk management and other, net	3,096	(3,210)	1,797
Total Revenues	557,290	599,131	438,429
Costs and Expenses:
General and administrative, net	46,778	45,362	36,359
Depreciation, depletion, and amortization	247,178	221,230	162,572
Accretion of asset retirement obligation	5,121	4,570	3,956
Lease operating cost	115,470	104,791	81,929
Severance and other taxes	48,862	52,508	45,868
Interest expense, net	57,303	35,566	33,437
Total Costs and Expenses	520,712	464,027	364,121
Income from Continuing Operations Before Income Taxes	36,578	135,104	74,308
Provision for Income Taxes	15,639	50,494	27,833
Income from Continuing Operations	20,939	84,610	46,475
Income (loss) from Discontinued Operations, net of taxes	0	14,211	(181)
Net Income	$ 20,939	$ 98,821	$ 46,294
Per Share Amounts-
Basic: Income from Continuing Operations (in dollars per share)	$ 0.48	$ 1.96	$ 1.19
Income (loss) from Discontinued Operations, net of taxes (in dollars per share)	$ 0.00	$ 0.33	$ 0.00
Net Income (in dollars per share)	$ 0.48	$ 2.29	$ 1.19
Diluted: Income from Continuing Operations (in dollars per share)	$ 0.48	$ 1.95	$ 1.18
Income (loss) from Discontinued Operations, net of taxes (in dollars per share)	$ 0.00	$ 0.33	$ 0.00
Net Income (in dollars per share)	$ 0.48	$ 2.27	$ 1.18
Weighted Average Shares Outstanding - Basic	42,840	42,394	38,300
Weighted Average Shares Outstanding - Diluted	42,930	42,629	38,524