CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating revenues
Oil and gas sales	$ 34,682	$ 31,361	$ 96,237	$ 89,893
Operating expenses
Lease operating expense and taxes	9,257	7,084	27,384	22,761
Depreciation, depletion and amortization	10,987	13,234	34,368	34,571
General and administrative	3,124	4,417	11,371	14,927
Total operating expenses	23,368	24,735	73,123	72,259
Income from operations	11,314	6,626	23,114	17,634
Other income (expense)
Interest and other income	5,315	15	5,346	59
Interest expense	(760)	(853)	(2,234)	(2,458)
Gain (loss) on derivative financial instruments	(1,205)	(3,383)	491	(3,772)
Total other income (expense)	3,350	(4,221)	3,603	(6,171)
Income before taxes	14,664	2,405	26,717	11,463
Deferred income tax expense (benefit)	6	(3)	45	(14)
Net income	14,658	2,408	26,672	11,477
Less dividends and accretion on preferred shares	2	3	8	8
Net income applicable to common stockholders	$ 14,656	$ 2,405	$ 26,664	$ 11,469
Earnings per share - Basic (in dollars per share)	$ 0.20	$ 0.03	$ 0.37	$ 0.16
Earnings per share - Diluted (in dollars per share)	$ 0.20	$ 0.03	$ 0.37	$ 0.16
Weighted average common shares outstanding - Basic (in shares)	72,424,626	71,178,903	72,235,047	71,089,212
Weighted average common shares outstanding - Diluted (in shares)	72,618,733	72,040,393	72,425,850	72,027,145