Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Net commodity sales		$ 66,707	$ 58,427	$ 115,326	$ 116,316
Sublease revenue		1,198	1,198	2,396	2,396
Total revenues		67,905	59,625	117,722	118,712
Costs and expenses:
Lease operating		13,371	15,009	25,665	29,552
Production taxes		3,802	2,768	6,682	5,445
Depreciation, depletion and amortization		30,282	20,407	53,997	41,513
Impairment of oil and gas assets		63,593	0	113,315	0
Impairment of other assets		6,407	0	6,407	0
General and administrative		7,315	8,190	15,628	19,697
Cost reduction initiatives		0	824	0	824
Other		403	403	806	1,231
Total costs and expenses		125,173	47,601	222,500	98,262
Operating (loss) income		(57,268)	12,024	(104,778)	20,450
Non-operating income (expense):
Interest expense		(5,571)	(1,739)	(10,135)	(3,110)
Derivative gains (losses)		17,734	(32,286)	(33,282)	(48,787)
Gain (loss) on sale of assets		491	469	490	(575)
Other (expense) income, net		(302)	19	(288)	104
Net non-operating income (expense)		12,352	(33,537)	(43,215)	(52,368)
Reorganization items, net		(313)	(480)	(776)	(1,517)
Loss before income taxes		(45,229)	(21,993)	(148,769)	(33,435)
Income tax expense		0	0	0	0
Net loss		$ (45,229)	$ (21,993)	$ (148,769)	$ (33,435)
Earnings per share:
Basic for Class A and Class B (in dollars per share)	[1]	$ (0.99)	$ (0.49)	$ (3.27)	$ (0.74)
Diluted for Class A and Class B (in dollars per share)	[1]	$ (0.99)	$ (0.49)	$ (3.27)	$ (0.74)
Weighted average shares used to compute earnings per share:
Basic for Class A and Class B (in shares)	[1]	45,641,797	45,338,650	45,549,518	45,241,513
Diluted for Class A and Class B (in shares)	[1]	45,641,797	45,338,650	45,549,518	45,241,513

[1] See “Note 2: Earnings per share.”