Consolidated Statements Of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Revenues	$ 47,852	$ 18,135	$ 84,544	$ 35,751
Expenses
Lease operating and gas gathering	6,490	3,521	11,074	6,477
Production and ad valorem taxes	2,761	1,077	4,927	2,114
Depreciation, depletion and amortization	20,737	13,498	36,162	25,472
Loss on sale of oil and gas properties	0	205	1,568	348
Impairment of oil and natural gas properties	0	27,081	0	27,081
Loss on sale of oil and gas properties	5,305	3,600	8,724	6,281
Acquisition costs and other	(3)	2,680	(13)	2,669
Total expenses	35,290	51,662	62,442	70,442
Income (loss) from operations	12,562	(33,527)	22,102	(34,691)
Other (expense) income
Interest expense	(9,298)	(8,819)	(18,555)	(13,851)
Unrealized (loss) gain on warrants	(2,462)	614	(2,615)	2,884
(Loss) gain on derivative financial instruments	(25,498)	5,416	(36,654)	14,162
Loss on extinguishment of debt	0	0	(8,619)	0
Total other (expense) income, net	(37,258)	(2,789)	(66,443)	3,195
Loss before income taxes	(24,696)	(36,316)	(44,341)	(31,496)
Income tax benefit	3,103	12,601	6,211	10,898
Net loss	(21,593)	(23,715)	(38,130)	(20,598)
Preferred stock dividends	(1,932)	(296)	(3,821)	(296)
Net loss attributable to common stockholders	$ (23,525)	$ (24,011)	$ (41,951)	$ (20,894)
Net loss per common share
Basic (in dollars per share)	$ (0.96)	$ (1.10)	$ (1.71)	$ (0.96)
Diluted (in dollars per share)	$ (0.96)	$ (1.10)	$ (1.71)	$ (0.96)
Weighted average common shares outstanding
Basic (in shares)	24,599,744	21,822,015	24,598,345	21,822,015
Diluted (in shares)	24,599,744	21,822,015	24,598,345	21,822,015
Warrant	$ (4,086)		$ (4,086)
Oil sales
Revenues
Revenues	39,707	$ 15,090	72,859	$ 29,580
Natural gas liquid sales
Revenues
Revenues	4,410	1,319	6,143	2,989
Natural gas sales
Revenues
Revenues	$ 3,735	$ 1,726	$ 5,542	$ 3,182