Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenues
Revenues	$ 94,068	$ 57,972
Expenses
Lease operating and gas gathering	16,763	16,232
Production and ad valorem taxes	5,523	3,287
Rig standby expense	622	2,261
Depletion, depreciation, and amortization	56,818	51,995
Accretion of asset retirement obligations	139	180
Loss (gain) on sale of oil and gas properties	466	(74)
Impairment of oil and gas properties	33,413	35,570
General and administrative (inclusive of $1.6 million and $0.4 million of stock-based compensation)	12,626	11,767
Acquisition costs	3,202
Other	(63)	1,261
Total expenses	129,509	122,479
Loss from operations	(35,441)	(64,507)
Other income (expense)
Interest expense	(20,769)	(22,840)
Gain on redemption of bonds		28,480
Amortization of finance costs	(5,302)	(6,743)
Unrealized gain on warrants	3,088	568
Loss on derivative financial instruments	(14,080)	(8,672)
Total other expense, net	(37,063)	(9,207)
Loss before income taxes	(72,504)	(73,714)
Income tax benefit (expense)	29,019	(24,986)
Net loss	(43,485)	(98,700)
Preferred stock dividends	(3,968)
Net loss attributable to common stockholders	$ (47,453)	$ (98,700)
Net loss per common share
Basic	$ (2.13)	$ (12.17)
Diluted	$ (2.13)	$ (12.17)
Weighted Average Shares Outstanding
Basic	22,252,149	8,106,931
Diluted	22,252,149	8,106,931
Oil sales
Revenues
Revenues	$ 80,505	$ 46,954
Natural gas sales
Revenues
Revenues	6,477	7,165
Natural gas liquid sales
Revenues
Revenues	$ 7,086	$ 3,853