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	$ 141,433	$ 160,486	$ 179,038
Gas gathering revenue	158	214	225
Total revenues	141,591	160,700	179,263
Expenses:
Lease operating expenses	38,890	38,571	39,012
Production taxes	885	3,100	4,917
Depreciation, depletion and amortization	60,689	58,243	59,326
Ceiling test write-down	137,100	18,907	0
General and administrative	22,957	20,436	21,341
Accretion of asset retirement obligation	2,078	2,049	1,306
Interest expense	9,808	9,648	9,952
Total expenses	272,407	150,954	135,854
Other income (expense):
Gain on legal settlement	0	0	12,400
Loss on early extinguishment of debt	0	0	(5,973)
Other income (expense)	606	(1,008)	(1,080)
Derivative income (expense)	(233)	0	0
Other Income (Expense), Net	373	(1,008)	5,347
Income (loss) from operations	(130,443)	8,738	48,756
Income tax expense (benefit)	1,636	(1,810)	1,630
Net income (loss)	(132,079)	10,548	47,126
Preferred stock dividend	5,139	5,139	5,139
Net income (loss) available to common stockholders	$ (137,218)	$ 5,409	$ 41,987
Basic
Net income (loss) per share (in usd per share)	$ (2.20)	$ 0.08	$ 0.67
Diluted
Net income (loss) per share (in usd per share)	$ (2.20)	$ 0.08	$ 0.66
Weighted average number of common shares:
Basic (shares)	62,459	61,937	61,415
Diluted (shares)	62,459	62,325	61,789