Unaudited Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues
Revenues	$ 40,741	$ 36,692
Expenses
Lease operating and gas gathering	7,710	4,584
Production and ad valorem taxes	2,291	2,166
Depreciation, depletion and amortization	17,970	15,425
Loss on sale of oil and gas properties	32,894	0
Loss on sale of oil and gas properties	4,379	3,409
Acquisition costs and other	(2)	1,568
Total expenses	65,242	27,152
(Loss) income from operations	(24,501)	9,540
Other expense
Interest expense	(10,656)	(9,258)
Change in fair value of warrants	(102)	(152)
Loss on derivative financial instruments	(36,238)	(11,156)
Loss on extinguishment of debt	0	(8,619)
Total other expense	(46,996)	(29,185)
Loss before income taxes	(71,497)	(19,645)
Income tax benefit	12,933	3,109
Net loss	(58,564)	(16,536)
Preferred stock dividends	(2,065)	(1,889)
Net loss attributable to common stockholders	$ (60,629)	$ (18,425)
Net loss per common share
Basic (in dollars per share)	$ (2.45)	$ (0.75)
Diluted (in dollars per share)	$ (2.45)	$ (0.75)
Weighted average common shares outstanding
Basic (in shares)	24,698,372	24,559,132
Diluted (in shares)	24,698,372	24,559,132
Oil sales
Revenues
Revenues	$ 33,584	$ 33,152
Natural gas liquid sales
Revenues
Revenues	3,393	1,734
Natural gas sales
Revenues
Revenues	$ 3,764	$ 1,806