Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
REVENUES
Natural gas, oil and natural gas liquids sales	$ 110,184	$ 99,432
Brokered natural gas and marketing revenue	8	2,431
Total revenues	110,192	101,863
OPERATING EXPENSES
Lease operating	9,390	2,343
Transportation, gathering and compression	27,689	32,877
Production and ad valorem taxes	2,445	1,931
Brokered natural gas and marketing expense	48	2,460
Depreciation, depletion and amortization	31,156	26,189
Exploration	15,278	11,581
General and administrative	9,757	10,132
Accretion of asset retirement obligations	155	124
(Gain) loss on sale of assets	(267)	(5)
Total operating expenses	95,651	87,632
OPERATING INCOME (LOSS)	14,541	14,231
OTHER INCOME (EXPENSE)
Gain (loss) on derivative instruments	(4,215)	25,097
Interest expense, net	(12,952)	(12,462)
Other income (expense)		(19)
Total other income (expense), net	(17,167)	12,616
INCOME (LOSS) BEFORE INCOME TAXES	(2,626)	26,847
NET INCOME (LOSS)	$ (2,626)	$ 26,847
NET INCOME (LOSS) PER COMMON SHARE
Basic	$ (0.01)	$ 0.10
Diluted	$ (0.01)	$ 0.10
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING
Basic	293,450	261,105
Diluted	293,450	264,215