Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
REVENUES
Revenues	$ 90,684	$ 155,540	$ 224,108	$ 297,037
OPERATING EXPENSES
Lease operating	9,900	10,141	21,943	17,666
Transportation, gathering and compression	$ 51,387	$ 51,870	$ 105,512	$ 93,038
Cost, Product and Service [Extensible List]	us-gaap:NaturalGasGatheringTransportationMarketingAndProcessingMember	us-gaap:NaturalGasGatheringTransportationMarketingAndProcessingMember	us-gaap:NaturalGasGatheringTransportationMarketingAndProcessingMember	us-gaap:NaturalGasGatheringTransportationMarketingAndProcessingMember
Production and ad valorem taxes	$ 1,600	$ 4,009	$ 6,468	$ 6,857
Brokered natural gas and marketing expense	7,746	11,983	17,004	21,443
Depreciation, depletion, amortization and accretion	42,768	38,597	86,903	68,494
Exploration	9,073	15,193	22,344	31,981
General and administrative	11,569	13,564	21,450	42,494
(Gain) loss on sale of assets	(1,911)	1	(1,357)	2
Other expense	19	12	34	38
Total operating expenses	132,151	145,370	280,301	282,013
OPERATING INCOME (LOSS)	(41,467)	10,170	(56,193)	15,024
OTHER INCOME (EXPENSE)
Gain (loss) on derivative instruments	(10,925)	29,738	29,207	24,808
Interest expense, net	(14,930)	(15,109)	(29,764)	(28,949)
Other income	4	8	17	8
Total other income (expense), net	(25,851)	14,637	(540)	(4,133)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(67,318)	24,807	(56,733)	10,891
INCOME (LOSS) FROM CONTINUING OPERATIONS	(67,318)	24,807	(56,733)	10,891
Income (loss) from discontinued operations, net of income tax	(1,533)	2,705	(9,291)	2,523
NET INCOME (LOSS)	$ (68,851)	$ 27,512	$ (66,024)	$ 13,414
Basic:
Weighted average common stock outstanding	35,856	35,678	35,816	30,645
Income (loss) from continuing operations	$ (1.88)	$ 0.69	$ (1.58)	$ 0.36
Income (loss) from discontinued operations	(0.04)	0.08	(0.26)	0.08
Net income (loss)	$ (1.92)	$ 0.77	$ (1.84)	$ 0.44
Diluted:
Weighted average common stock outstanding	35,856	35,826	35,816	30,830
Income (loss) from continuing operations	$ (1.88)	$ 0.69	$ (1.58)	$ 0.36
Income (loss) from discontinued operations	(0.04)	0.08	(0.26)	0.08
Net income (loss)	$ (1.92)	$ 0.77	$ (1.84)	$ 0.44
Oil and Gas [Member]
REVENUES
Revenues	$ 83,082	$ 143,429	$ 206,953	$ 275,257
Brokered Natural Gas and Marketing Revenue [Member]
REVENUES
Revenues	7,540	11,989	17,028	21,519
Other Revenue [Member]
REVENUES
Revenues	$ 62	$ 122	$ 127	$ 261