CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues:
Oil and gas production revenues	$ 56,493	$ 67,002	$ 133,701
Other	62	28	75
Total revenue	56,555	67,030	133,776
Operating costs and expenses:
Lease operating	18,205	23,074	25,875
Production taxes	5,454	6,679	11,462
Rig expense	664	0	0
Depreciation, depletion, and amortization	24,431	38,721	43,139
Proved property impairment	67,626	128,573	0
General and administrative (including stock-based compensation of $2,703, $3,912 and $3,194, respectively)	13,562	11,788	13,378
Operating expenses	129,942	208,835	93,854
Operating income (loss)	(73,387)	(141,805)	39,922
Other (income) expense:
Interest income	(1)	(2)	(2)
Interest expense	4,319	3,906	2,570
Amortization of deferred financing fees	1,019	643	934
(Gain) on sale of properties	(374)	0	0
(Gain) loss on derivative contracts	18,028	(19,301)	(25,237)
Other	0	318	(7)
Total other (income) expense	22,991	(14,436)	(21,742)
Income (loss) from continuing operations before income tax	(96,378)	(127,369)	61,664
Income tax benefit	0	279	287
Net income (loss) from continuing operations	(96,378)	(127,090)	61,951
Net income (loss) from discontinued operations - net of tax	0	(20)	1,318
Net income (loss)	$ (96,378)	$ (127,110)	$ 63,269
Net income (loss) per common share - basic
Continuing operations (in dollars per share)	$ (0.79)	$ (1.21)	$ 0.63
Discontinued operations (in dollars per share)	0.00	0.00	0.01
Total (in dollars per share)	(0.79)	(1.21)	0.64
Net income (loss) per common share - diluted
Continuing operations (in dollars per share)	(0.79)	(1.21)	0.61
Discontinued operations (in dollars per share)	0.00	0.00	0.01
Total (in dollars per share)	$ (0.79)	$ (1.21)	$ 0.62
Weighted Average Number of Shares Outstanding, Basic and Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	122,132	104,605	98,835
Weighted Average Number of Shares Outstanding, Diluted	122,132	104,605	101,468