Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Crude oil, natural gas and NGLs sales	$ 232,733	$ 141,805	$ 636,027	$ 328,013
Commodity price risk management gain, net of settlements	(52,178)	19,397	86,458	(62,348)
Other income	2,680	2,688	9,615	9,153
Total revenues	183,235	163,890	732,100	274,818
Costs, expenses and other:
Lease operating expenses	25,353	14,001	65,170	43,006
Production taxes	15,516	9,568	42,957	19,682
Transportation, gathering and processing expenses	9,794	5,048	22,184	13,554
General and administrative expense	29,299	32,510	85,145	78,868
Exploration, geologic, and geophysical expense	41,908	241	43,895	688
Depreciation, depletion and amortization	125,238	112,927	360,567	317,329
Impairment of properties and equipment	252,740	933	282,499	6,104
Impairment of goodwill	75,121	0	75,121	0
Accretion of asset retirement obligation	1,472	1,777	4,906	5,400
Gain on sale of properties and equipment	(62)	(219)	(754)	(43)
Provision for uncollectible notes receivable	0	(700)	(40,203)	44,038
Other expenses	2,947	3,092	10,365	7,795
Total cost, expenses and other	579,326	179,178	951,852	536,421
Loss from operations	(396,091)	(15,288)	(219,752)	(261,603)
Interest expense	(19,275)	(20,193)	(58,359)	(42,759)
Interest income	479	140	1,487	1,875
Loss before income taxes	(414,887)	(35,341)	(276,624)	(302,487)
Income tax benefit	122,350	12,032	71,483	112,198
Net loss	$ (292,537)	$ (23,309)	$ (205,141)	$ (190,289)
Earnings per share:
Basic	$ (4.44)	$ (0.48)	$ (3.12)	$ (4.16)
Diluted	$ (4.44)	$ (0.48)	$ (3.12)	$ (4.16)
Weighted-average common shares outstanding
Basic	65,865	48,839	65,825	45,741
Diluted	65,865	48,839	65,825	45,741