Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Net commodity sales		$ 51,838	$ 65,519	$ 167,164	$ 181,835
Sublease revenue		799	1,199	3,195	3,595
Total revenues		52,637	66,718	170,359	185,430
Costs and expenses:
Lease operating		12,372	12,493	38,037	42,045
Production taxes		2,925	4,028	9,607	9,473
Depreciation, depletion and amortization		28,021	22,252	82,018	63,765
Impairment of oil and gas assets		147,686	0	261,001	0
Impairment of other assets		0	0	6,407	0
General and administrative		7,809	9,021	23,437	28,718
Cost reduction initiatives		0	210	0	1,034
Other		269	402	1,075	1,633
Total costs and expenses		199,082	48,406	421,582	146,668
Operating (loss) income		(146,445)	18,312	(251,223)	38,762
Non-operating income (expense):
Interest expense		(5,994)	(4,205)	(16,129)	(7,315)
Derivative gains (losses)		23,601	(23,677)	(9,681)	(72,464)
Gain (loss) on sale of assets		141	(2,024)	631	(2,599)
Loss on extinguishment of debt		(1,624)	0	(1,624)	0
Other (expense) income, net		(84)	19	(372)	123
Net non-operating income (expense)		16,040	(29,887)	(27,175)	(82,255)
Reorganization items, net		(530)	(493)	(1,306)	(2,010)
Loss before income taxes		(130,935)	(12,068)	(279,704)	(45,503)
Income tax expense		0	0	0	0
Net loss		$ (130,935)	$ (12,068)	$ (279,704)	$ (45,503)
Earnings per share:
Basic for Class A and Class B (in dollars per share)	[1]	$ (2.86)	$ (0.27)	$ (6.13)	$ (1.01)
Diluted for Class A and Class B (in dollars per share)	[1]	$ (2.86)	$ (0.27)	$ (6.13)	$ (1.01)
Weighted average shares used to compute earnings per share:
Basic for Class A and Class B (in shares)	[1]	45,716,522	45,333,745	45,605,798	45,272,595
Diluted for Class A and Class B (in shares)	[1]	45,716,522	45,333,745	45,605,798	45,272,595

[1] See “Note 2: Earnings per share.”