CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Oil and gas production revenues	$ 86,189	$ 56,493	$ 67,002
Other	75	62	28
Total revenue	86,264	56,555	67,030
Operating costs and expenses:
Lease operating	15,197	18,205	23,074
Production taxes	7,228	5,454	6,679
Rig expense	0	664	0
Depreciation, depletion, and amortization	26,226	24,431	38,721
Proved property impairment	0	67,626	128,573
General and administrative (including stock-based compensation of $3,912, $3,194 and $3,238, respectively)	16,276	13,562	11,788
Operating expenses	64,927	129,942	208,835
Operating (loss) income	21,337	(73,387)	(141,805)
Other (income) expense:
Interest income	(1)	(1)	(2)
Interest expense	2,948	4,319	3,906
Amortization of deferred financing fees	423	1,019	643
(Gain) on sale of properties	(102)	(374)	0
(Gain) loss on derivative contracts	1,849	18,028	(19,301)
Other	214	0	318
Total other (income) expense	5,331	22,991	(14,436)
(Loss) income from continuing operations before income tax	16,006	(96,378)	(127,369)
Income tax benefit	0	0	279
Net (loss) income from continuing operations	16,006	(96,378)	(127,090)
Net loss from discontinued operations - net of tax	0	0	(20)
Net income (loss)	$ 16,006	$ (96,378)	$ (127,110)
Net (loss) income per common share - basic
Continuing operations (in dollars per share)	$ 0.10	$ (0.79)	$ (1.21)
Discontinued operations (in dollars per share)	0.00	0.00	0.00
Total (in dollars per share)	0.10	(0.79)	(1.21)
Net (loss) income per common share - diluted
Continuing operations (in dollars per share)	0.10	(0.79)	(1.21)
Discontinued operations (in dollars per share)	0.00	0.00	0.00
Total (in dollars per share)	$ 0.10	$ (0.79)	$ (1.21)
Weighted Average Number of Shares Outstanding, Basic and Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	161,141	122,132	104,605
Weighted Average Number of Shares Outstanding, Diluted	162,844	122,132	104,605
Oil [Member]
Revenues:
Oil and gas production revenues	$ 73,584	$ 50,965	$ 59,270
Natural Gas [Member]
Revenues:
Oil and gas production revenues	6,898	3,978	5,854
Natural Gas Liquids [Member]
Revenues:
Oil and gas production revenues	$ 5,707	$ 1,550	$ 1,878