Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenues
Revenues	$ 201,169	$ 94,068
Expenses
Lease operating and gas gathering	26,008	17,385
Production and ad valorem taxes	11,029	5,523
Depreciation, depletion and amortization	83,582	56,957
Loss on sale of oil and gas properties	0	466
Impairment of oil and gas properties	12,169	33,413
General and administrative	16,017	12,626
Acquisition costs and other	1,821	3,139
Total expenses	150,626	129,509
Income (loss) from operations	50,543	(35,441)
Income (loss) from operations
Interest expense	(38,943)	(26,071)
Unrealized gain on warrants	416	3,088
Gain (loss) on derivative financial instruments	22,744	(14,080)
Loss on extinguishment of debt	(8,620)	0
Total other expense, net	(24,403)	(37,063)
Income (loss) before income taxes	26,140	(72,504)
Income tax (expense) benefit	(6,792)	29,019
Net income (loss)	19,348	(43,485)
Preferred stock dividends	(7,816)	(3,968)
Net income (loss) attributable to common stockholders	$ 11,532	$ (47,453)
Net income (loss) per common share attributable to common stockholders
Basic (in dollars per share)	$ 0.29	$ (2.13)
Diluted (in dollars per share)	$ 0.28	$ (2.13)
Weighted Average Shares Outstanding
Basic (in shares)	24,619,730	22,252,149
Diluted (in shares)	24,801,143	22,252,149
Oil sales
Revenues
Revenues	$ 167,743	$ 80,505
Natural gas liquid sales
Revenues
Revenues	18,471	7,086
Natural gas sales
Revenues
Revenues	$ 14,955	$ 6,477