CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating Revenues:
Total operating revenues	$ 43,300	$ 107,584	$ 122,866	$ 209,564
Operating Expenses:
Production tax expense	1,449	8,905	(1,059)	12,798
Exploration expense	21	12	52	37
Impairment and abandonment expense	810	995	1,266,236	1,317
(Gain) loss on sale of properties	4,779	2,906	4,779	2,901
Depreciation, depletion and amortization	24,908	72,612	99,833	145,222
Unused commitments	4,378	4,352	8,836	8,821
General and administrative expense	12,890	12,401	23,105	25,061
Merger transaction expense	0	0	0	2,414
Other operating expenses, net	(557)	4	(502)	(20)
Total operating expenses	62,006	114,701	1,430,101	224,065
Operating Income (Loss)	(18,706)	(7,117)	(1,307,235)	(14,501)
Other Income and Expense:
Interest and other income (expense)	259	154	64	468
Interest expense	(15,388)	(14,381)	(29,771)	(28,060)
Commodity derivative gain (loss)	(33,793)	19,544	158,395	(85,647)
Total other income and expense	(48,922)	5,317	128,688	(113,239)
Income (Loss) before Income Taxes	(67,628)	(1,800)	(1,178,547)	(127,740)
(Provision for) Benefit from Income Taxes	0	(110)	95,280	29,601
Net Income (Loss)	$ (67,628)	$ (1,910)	$ (1,083,267)	$ (98,139)
Net Income (Loss) Per Common Share, Basic (in dollars per share)	$ (0.32)	$ (0.01)	$ (5.12)	$ (0.47)
Net Income (Loss) Per Common Share, Diluted (in dollars per share)	$ (0.32)	$ (0.01)	$ (5.12)	$ (0.47)
Weighted Average Common Shares Outstanding, Basic (in shares)	211,894,790	210,377,152	211,503,310	210,155,678
Weighted Average Common Shares Outstanding, Diluted (in shares)	211,894,790	210,377,152	211,503,310	210,155,678
Oil, gas and NGL production
Operating Revenues:
Production and other revenues	$ 43,300	$ 107,486	$ 122,866	$ 209,191
Other operating revenues, net
Operating Revenues:
Production and other revenues	0	98	0	373
Lease operating expense
Operating Expenses:
Cost of goods and services	9,074	10,772	20,155	22,049
Gathering, transportation and processing expense
Operating Expenses:
Cost of goods and services	$ 4,254	$ 1,742	$ 8,666	$ 3,465