Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
REVENUES
Natural gas, oil and natural gas liquids sales	$ 223,015	$ 234,601	$ 137,816
Brokered natural gas and marketing revenue	12,019	20,720
Total revenues	235,034	255,321	137,816
OPERATING EXPENSES
Lease operating	9,023	13,904	8,518
Transportation, gathering and compression	109,226	85,846	18,114
Production and ad valorem taxes	4,998	11,621	7,084
Brokered natural gas and marketing expense	12,268	26,173
Depreciation, depletion and amortization	92,948	244,750	89,218
Exploration	52,775	116,211	21,186
General and administrative	39,431	46,409	42,109
Rig termination and standby	3,846	9,672	3,283
Impairment of proved oil and gas properties	17,665	691,334	34,855
Accretion of asset retirement obligations	391	1,623	791
(Gain) loss on sale of assets	6,936	(4,737)	(960)
Gain on reduction of pension obligations			(2,208)
Total operating expenses	349,507	1,242,806	221,990
OPERATING LOSS	(114,473)	(987,485)	(84,174)
OTHER INCOME (EXPENSE)
Gain (loss) on derivative instruments	(52,338)	56,021	20,791
Interest expense, net	(50,789)	(53,400)	(48,347)
Gain (loss) on early extinguishment of debt	14,489	(59,392)
Other income (expense)	(149)	400	353
Total other expense, net	(88,787)	(56,371)	(27,203)
LOSS BEFORE INCOME TAXES	(203,260)	(1,043,856)	(111,377)
INCOME TAX BENEFIT (EXPENSE)	(546)	72,446	(71,799)
NET LOSS	$ (203,806)	$ (971,410)	$ (183,176)
NET LOSS PER COMMON SHARE
Basic and diluted	$ (0.84)	$ (4.46)	$ (1.27)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING
Basic and diluted	241,434	217,897	144,369