Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Oil and gas sales	$ 155,049	$ 127,946	$ 442,418	$ 396,068
Price-risk management and other, net	(2,048)	804	(714)	3,317
Total Revenues	153,001	128,750	441,704	399,385
Costs and Expenses:
General and administrative, net	11,146	11,952	35,062	36,025
Depreciation, depletion, and amortization	66,948	58,987	186,526	181,638
Accretion of asset retirement obligation	1,478	1,191	4,732	3,465
Lease operating cost	23,078	22,275	77,459	71,656
Transportation and gas processing	5,783	4,359	16,678	13,674
Severance and other taxes	11,695	10,680	31,971	35,840
Interest expense, net	17,495	13,762	51,297	40,546
Total Costs and Expenses	137,623	123,206	403,725	382,844
Income Before Income Taxes	15,378	5,544	37,979	16,541
Provision for Income Taxes	6,492	2,422	15,162	6,821
Net Income	$ 8,886	$ 3,122	$ 22,817	$ 9,720
Per Share Amounts-
Earnings Per Share (Basic)	$ 0.20	$ 0.07	$ 0.53	$ 0.23
Earnings Per Share (Diluted)	$ 0.20	$ 0.07	$ 0.52	$ 0.23
Weighted Average Shares Outstanding - Basic	43,389	42,901	43,308	42,812
Weighted Average Shares Outstanding - Diluted	43,704	43,239	43,624	43,158