CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues and other:
Revenues and other	$ 128,036	$ 141,778
Gains (losses) on derivatives	199,194	(63,124)
Total revenues and other	339,265	76,539
Expenses and other:
Transportation expenses	1,822	2,173
Marketing expenses	430	851
General and administrative expenses	19,337	14,340
Depreciation, depletion, and amortization	35,329	24,585
Impairment of oil and gas properties	289,085	0
Taxes, other than income taxes	4,352	8,086
Losses (gains) on derivatives	(199,194)	63,124
Other operating expenses	2,202	1,245
Total expenses and other	419,290	114,853
Other (expenses) income:
Interest expense	(8,920)	(8,805)
Other, net	(6)	154
Total other (expenses) income	(8,926)	(8,651)
Reorganization items, net	0	(231)
Loss before income taxes	(88,951)	(47,196)
Income tax expense (benefit)	26,349	(13,098)
Net loss	$ (115,300)	$ (34,098)
Net loss per share:
Basic (in dollars per share)	$ (1.45)	$ (0.42)
Diluted (in dollars per share)	$ (1.45)	$ (0.42)
Oil, natural gas and natural gas liquids sales
Revenues and other:
Revenues and other	$ 122,098	$ 131,102
Expenses and other:
Cost of goods sold	50,752	57,928
Electricity sales
Revenues and other:
Revenues and other	5,461	9,729
Expenses and other:
Cost of goods sold	3,946	7,760
Oil
Revenues and other:
Gains (losses) on derivatives	211,229	(65,239)
Expenses and other:
Losses (gains) on derivatives	(211,229)	65,239
Marketing revenues
Revenues and other:
Revenues and other	453	830
Other revenues
Revenues and other:
Revenues and other	24	117
Natural gas sales
Revenues and other:
Revenues and other	3,368	6,715
Gains (losses) on derivatives	(12,035)	2,115
Expenses and other:
Losses (gains) on derivatives	$ 12,035	$ (2,115)