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	19,464	12,551	35,027	24,693
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	34,017	50,715	61,307	69,663
Income (loss) from operations	13,835	(32,580)	23,237	(33,912)
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	(23,423)	(35,369)	(43,206)	(30,717)
Income tax benefit	4,648	12,208	7,778	10,621
Net loss	(18,775)	(23,161)	(35,428)	(20,096)
Preferred stock dividends	(1,932)	(296)	(3,821)	(296)
Net loss attributable to common stockholders	$ (20,707)	$ (23,457)	$ (39,249)	$ (20,392)
Net loss per common share
Basic (in dollars per share)	$ (0.84)	$ (1.07)	$ (1.60)	$ (0.93)
Diluted (in dollars per share)	$ (0.84)	$ (1.07)	$ (1.60)	$ (0.93)
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