Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues:
Oil and gas sales	$ 148,558	$ 146,477
Price-risk management and other, net	(4,877)	(240)
Total Revenues	143,681	146,237
Costs and Expenses:
General and administrative, net	10,739	12,725
Depreciation, depletion, and amortization	61,685	60,120
Accretion of asset retirement obligation	1,386	1,775
Lease operating cost	25,267	27,424
Transportation and gas processing	5,292	6,030
Severance and other taxes	9,202	9,775
Interest expense, net	18,449	16,802
Total Costs and Expenses	132,020	134,651
Income Before Income Taxes	11,661	11,586
Provision for Income Taxes	6,248	4,377
Net Income	$ 5,413	$ 7,209
Per Share Amounts-
Earnings Per Share (Basic)	$ 0.12	$ 0.17
Earnings Per Share (Diluted)	$ 0.12	$ 0.17
Weighted Average Shares Outstanding - Basic	43,628	43,167
Weighted Average Shares Outstanding - Diluted	44,118	43,603