Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
REVENUES
Revenues	$ 515,145	$ 383,659	$ 235,034
OPERATING EXPENSES
Lease operating	28,289	20,525	9,023
Production and ad valorem taxes	10,141	8,490	7,927
Brokered natural gas and marketing expense	16,886	3,191	12,268
Depreciation, depletion and amortization	134,277	118,818	92,948
Exploration	49,563	50,208	52,775
General and administrative	44,389	44,553	39,431
Rig termination and standby		1	3,846
Impairment of proved oil and gas properties			17,665
Accretion of asset retirement obligations	663	544	391
(Gain) loss on sale of assets	(1,815)	(179)	6,936
Total operating expenses	421,159	370,990	352,436
OPERATING INCOME (LOSS)	93,986	12,669	(117,402)
OTHER INCOME (EXPENSE)
Gain (loss) on derivative instruments	(21,169)	45,365	(52,338)
Interest expense, net	(53,990)	(49,490)	(50,789)
Gain (loss) on early extinguishment of debt			14,489
Other income (expense)	(1)	(19)	(149)
Total other income (expense), net	(75,160)	(4,144)	(88,787)
INCOME (LOSS) BEFORE INCOME TAXES	18,826	8,525	(206,189)
INCOME TAX BENEFIT (EXPENSE)			(546)
NET INCOME (LOSS)	$ 18,826	$ 8,525	$ (206,735)
NET INCOME (LOSS) PER COMMON SHARE (See Note 11)
Basic	$ 0.94	$ 0.49	$ (12.84)
Diluted	$ 0.94	$ 0.48	$ (12.84)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING (See Note 11)
Basic	19,999	17,479	16,096
Diluted	20,087	17,679	16,096
Oil and Gas [Member]
REVENUES
Revenues	$ 498,593	$ 380,178	$ 223,015
Brokered Natural Gas and Marketing Revenue [Member]
REVENUES
Revenues	16,552	3,481	12,019
Natural Gas, Gathering, Transportation, Marketing and Processing [Member]
OPERATING EXPENSES
Transportation, gathering and compression	$ 138,766	$ 124,839	$ 109,226