CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Operating revenues
Oil and gas sales	$ 30,735	$ 30,178	$ 61,554	$ 58,532
Operating expenses
Lease operating expense and taxes	8,330	7,177	18,126	15,677
Depreciation, depletion and amortization	11,810	11,232	23,381	21,337
General and administrative	3,930	6,217	8,247	10,510
Total operating expenses	24,070	24,626	49,754	47,524
Income from operations	6,665	5,552	11,800	11,008
Other income (expense)
Interest and other income	16	20	31	45
Interest expense	(724)	(830)	(1,474)	(1,605)
Gain (loss) on derivative financial instruments	3,260	489	1,695	(389)
Total other income (expense)	2,552	(321)	252	(1,949)
Income before taxes	9,217	5,231	12,052	9,059
Deferred income tax expense (benefit)	32	(28)	39	(11)
Net income	9,185	5,259	12,013	9,070
Less dividends and accretion on preferred shares	2	2	5	5
Net income applicable to common stockholders	$ 9,183	$ 5,257	$ 12,008	$ 9,065
Earnings per share - Basic (in dollars per share)	$ 0.13	$ 0.07	$ 0.17	$ 0.13
Earnings per share - Diluted (in dollars per share)	$ 0.13	$ 0.07	$ 0.17	$ 0.13
Weighted average common shares outstanding - Basic (in shares)	72,283,896	71,062,658	72,138,686	71,043,874
Weighted average common shares outstanding - Diluted (in shares)	72,852,877	71,958,314	72,723,453	72,094,323