Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues:
Oil and gas sales	$ 35,976	$ 35,997
Gas gathering revenue	33	44
Total revenues	36,009	36,041
Expenses:
Lease operating expenses	9,719	9,665
Production taxes	1,028	1,149
Depreciation, depletion and amortization	12,871	15,230
Ceiling test write-downs	0	20,111
General and administrative	4,716	5,579
Accretion of asset retirement obligation	332	500
Interest expense	2,864	2,270
Total expenses	31,530	54,504
Other income (expense):
Other income (expense)	194	149
Derivative expense	(437)	0
Other operating income (expense), net	(243)	149
Income (loss) from operations	4,236	(18,314)
Income tax expense (benefit)	349	(988)
Net income (loss)	3,887	(17,326)
Preferred stock dividend	1,280	1,282
Net income (loss) available to common stockholders	$ 2,607	$ (18,608)
Basic
Net income (loss) per share (in usd per share)	$ 0.04	$ (0.30)
Diluted
Net income (loss) per share (in usd per share)	$ 0.04	$ (0.30)
Weighted average number of common shares:
Basic (shares)	62,834	62,216
Diluted (shares)	63,029	62,216