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
Operating Revenues:
Total operating revenues	$ 107,584	$ 110,398	$ 209,564	$ 191,208
Operating Expenses:
Production tax expense	8,905	9,684	12,798	14,859
Exploration expense	12	7	37	20
Impairment, dry hole costs and abandonment expense	995	108	1,317	425
(Gain) loss on sale of properties	2,906	564	2,901	972
Depreciation, depletion and amortization	72,612	52,175	145,222	93,160
Unused commitments	4,352	4,572	8,821	9,110
General and administrative expense	12,401	11,624	25,061	21,731
Merger transaction expense	0	1,277	2,414	6,040
Other operating expenses, net	4	9	(20)	48
Total operating expenses	114,701	88,626	224,065	161,641
Operating Income (Loss)	(7,117)	21,772	(14,501)	29,567
Other Income and Expense:
Interest and other income	154	701	468	1,392
Interest expense	(14,381)	(13,093)	(28,060)	(26,183)
Commodity derivative gain (loss)	19,544	(56,286)	(85,647)	(76,619)
Total other income and expense	5,317	(68,678)	(113,239)	(101,410)
Income (Loss) before Income Taxes	(1,800)	(46,906)	(127,740)	(71,843)
(Provision for) Benefit from Income Taxes	(110)	0	29,601	0
Net Income (Loss)	$ (1,910)	$ (46,906)	$ (98,139)	$ (71,843)
Net Income (Loss) Per Common Share, Basic (in dollars per share)	$ (0.01)	$ (0.22)	$ (0.47)	$ (0.43)
Net Income (Loss) Per Common Share, Diluted (in dollars per share)	$ (0.01)	$ (0.22)	$ (0.47)	$ (0.43)
Weighted Average Common Shares Outstanding, Basic	210,377,152	209,393,002	210,155,678	166,731,287
Weighted Average Common Shares Outstanding, Diluted	210,377,152	209,393,002	210,155,678	166,731,287
Oil, gas and NGL production
Operating Revenues:
Production and other revenues	$ 107,486	$ 110,118	$ 209,191	$ 190,949
Other operating revenues, net
Operating Revenues:
Production and other revenues	98	280	373	259
Lease operating expense
Operating Expenses:
Cost of goods and services	10,772	7,594	22,049	13,845
Gathering, transportation and processing expense
Operating Expenses:
Cost of goods and services	$ 1,742	$ 1,012	$ 3,465	$ 1,431