CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Oil sales	$ 11,016	$ 45,953
Natural gas sales	25,147	20,569
Total oil and gas sales	36,163	66,522
Gain on exchange of oil and gas properties	740
Total revenues	36,903	66,522
Operating expenses:
Production taxes	1,186	2,974
Gathering and transportation	4,365	2,853
Lease operating	12,960	15,136
Exploration	7,753	42,229
Depreciation, depletion and amortization	38,836	91,889
General and administrative	5,575	7,966
Impairment of oil and gas properties	22,718	403
Total operating expenses	93,393	163,450
Operating loss	(56,490)	(96,928)
Other income (expenses):
Net gain (loss) on extinguishment of debt	33,380	(2,735)
Gain on derivative financial instruments	656
Other income	281	287
Interest expense	(29,944)	(20,754)
Total other income (expenses)	4,373	(23,202)
Loss before income taxes	(52,117)	(120,130)
(Provision for) benefit from income taxes	(4,460)	41,628
Net loss	$ (56,577)	$ (78,502)
Net loss per share – basic and diluted	$ (1.14)	$ (1.71)
Weighted average shares outstanding – basic and diluted	49,512	46,027