Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
REVENUES
Revenues	$ 163,295	$ 130,123	$ 460,332	$ 343,938
OPERATING EXPENSES
Lease operating	11,986	5,312	29,651	22,026
Production and ad valorem taxes	1,660	2,604	8,519	7,226
Brokered natural gas and marketing expense	10,574	3,237	32,017	3,715
Depreciation, depletion, amortization and accretion	45,456	34,439	113,950	98,672
Exploration	16,621	11,328	48,602	36,227
General and administrative	14,580	12,937	57,074	33,391
Rig termination and standby	1,221		1,221
(Gain) loss on sale of assets	(733)	6	(731)	(1,814)
Other expense	2		40
Total operating expenses	158,394	108,929	440,408	297,569
OPERATING INCOME	4,901	21,194	19,924	46,369
OTHER INCOME (EXPENSE)
Gain (loss) on derivative instruments	15,812	(3,263)	40,620	(24,055)
Interest expense, net	(15,192)	(13,932)	(44,140)	(39,975)
Other income (expense)		(1)	8	(1)
Total other income (expense), net	620	(17,196)	(3,512)	(64,031)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	5,521	3,998	16,412	(17,662)
INCOME (LOSS) FROM CONTINUING OPERATIONS	5,521	3,998	16,412	(17,662)
Income (loss) from discontinued operations, net of income tax	(1,237)		1,286
NET INCOME (LOSS)	$ 4,284	$ 3,998	$ 17,698	$ (17,662)
Basic:
Weighted average common stock outstanding	35,684	20,144	32,343	19,947
Income (loss) from continuing operations	$ 0.15	$ 0.20	$ 0.51	$ (0.89)
Income (loss) from discontinued operations	(0.03)		0.04
Net income (loss)	$ 0.12	$ 0.20	$ 0.55	$ (0.89)
Diluted:
Weighted average common stock outstanding	35,697	20,170	32,471	19,947
Income (loss) from continuing operations	$ 0.15	$ 0.20	$ 0.51	$ (0.89)
Income (loss) from discontinued operations	(0.03)		0.04
Net income (loss)	$ 0.12	$ 0.20	$ 0.55	$ (0.89)
Oil and Gas [Member]
REVENUES
Revenues	$ 153,021	$ 127,179	$ 428,278	$ 340,620
Brokered Natural Gas and Marketing Revenue [Member]
REVENUES
Revenues	10,228	2,944	31,747	3,318
Other Revenue [Member]
REVENUES
Revenues	46		307
Natural Gas, Gathering, Transportation, Marketing and Processing [Member]
OPERATING EXPENSES
Transportation, gathering and compression	$ 57,027	$ 39,066	$ 150,065	$ 98,126