Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Oil and gas sales	$ 182,804	$ 141,433	$ 160,486
Gas gathering revenue	66	158	214
Total revenues	182,870	141,591	160,700
Expenses:
Lease operating expenses	43,743	38,890	38,571
Production taxes	3,950	885	3,100
Depreciation, depletion and amortization	71,445	60,689	58,243
Ceiling test write-down	0	137,100	18,907
General and administrative	26,512	22,957	20,436
Accretion of asset retirement obligation	1,753	2,078	2,049
Interest expense	21,886	9,808	9,648
Total expenses	169,289	272,407	150,954
Other income (expense):
Other income (expense)	588	606	(1,008)
Derivative income (expense)	233	(233)	0
Other income (expense), net	821	373	(1,008)
Income (loss) from operations	14,402	(130,443)	8,738
Income tax expense (benefit)	320	1,636	(1,810)
Net income (loss)	14,082	(132,079)	10,548
Preferred stock dividend	5,139	5,139	5,139
Net income (loss) available to common stockholders	$ 8,943	$ (137,218)	$ 5,409
Basic
Net income (loss) per share (in usd per share)	$ 0.14	$ (2.20)	$ 0.08
Diluted
Net income (loss) per share (in usd per share)	$ 0.14	$ (2.20)	$ 0.08
Weighted average number of common shares:
Basic (shares)	63,054	62,459	61,937
Diluted (shares)	63,208	62,459	62,325