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	$ 149,057	$ 146,531
Price-risk management and other, net	(4,877)	(240)
Total Revenues	144,180	146,291
Costs and Expenses:
General and administrative, net	10,526	12,725
Depreciation, depletion, and amortization	62,651	60,456
Accretion of asset retirement obligation	1,386	1,775
Lease operating cost	24,967	26,884
Transportation and gas processing	5,292	4,738
Severance and other taxes	9,202	10,025
Interest expense, net	18,449	16,802
Total Costs and Expenses	132,473	133,405
Income Before Income Taxes	11,707	12,886
Provision for Income Taxes	6,265	4,848
Net Income	$ 5,442	$ 8,038
Per Share Amounts-
Earnings Per Share (Basic)	$ 0.12	$ 0.19
Earnings Per Share (Diluted)	$ 0.12	$ 0.18
Weighted Average Shares Outstanding - Basic	43,628	43,167
Weighted Average Shares Outstanding - Diluted	44,118	43,603