Consolidated Statements Of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues
Revenues	$ 58,737	$ 26,883	$ 143,281	$ 62,634
Expenses
Lease operating and gas gathering	6,687	4,576	17,761	11,053
Production and ad valorem taxes	3,218	1,541	8,145	3,656
Depreciation, depletion and amortization	23,775	16,530	59,937	42,003
Loss on sale of oil and gas properties	0	119	1,568	466
Impairment of oil and natural gas properties	12,169	0	12,169	27,081
Loss on sale of oil and gas properties	4,661	2,644	13,385	8,925
Acquisition costs and other	315	333	302	3,001
Total expenses	50,825	25,743	113,267	96,185
Income (loss) from operations	7,912	1,140	30,014	(33,551)
Other (expense) income
Interest expense	(10,215)	(5,965)	(28,771)	(19,816)
Unrealized (loss) gain on warrants	509	402	(2,105)	3,286
(Loss) gain on derivative financial instruments	(18,198)	(7,657)	(54,852)	6,505
Loss on extinguishment of debt	0	0	(8,619)	0
Total other expense, net	(27,904)	(13,220)	(94,347)	(10,025)
Loss before income taxes	(19,992)	(12,080)	(64,333)	(43,576)
Income tax benefit	282	4,956	6,493	15,854
Net loss	(19,710)	(7,124)	(57,840)	(27,722)
Preferred stock dividends	(1,975)	(1,824)	(5,796)	(2,120)
Net loss attributable to common stockholders	$ (21,685)	$ (8,948)	$ (63,636)	$ (29,842)
Net loss per common share
Basic (in dollars per share)	$ (0.88)	$ (0.41)	$ (2.59)	$ (1.37)
Diluted (in dollars per share)	$ (0.88)	$ (0.41)	$ (2.59)	$ (1.37)
Weighted average common shares outstanding
Basic (in shares)	24,599,744	21,822,015	24,598,816	21,822,015
Diluted (in shares)	24,599,744	21,822,015	24,598,816	21,822,015
Warrant	$ (3,576)		$ (3,576)
Oil sales
Revenues
Revenues	47,846	$ 23,162	120,705	$ 52,742
Natural gas liquid sales
Revenues
Revenues	6,795	1,831	12,939	4,820
Natural gas sales
Revenues
Revenues	$ 4,096	$ 1,890	$ 9,637	$ 5,072