CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating net revenues:
Oil and gas sales	$ 52,559,000	$ 44,174,000
Operating expenses:
Lease operating expense	9,925,000	13,298,000
Gas plant and midstream operating expense	2,705,000	3,789,000
Severance and ad valorem taxes	4,319,000	3,154,000
Exploration	3,407,000	266,000
Depreciation, depletion and amortization	21,212,000	26,379,000
Impairment of oil and gas properties	0	10,000,000
Abandonment and impairment of unproved properties	0	6,906,000
Unused commitments	993,000	0
General and administrative (including $1,725 and $3,004, respectively, of stock-based compensation)	12,094,000	17,685,000
Total operating expenses	54,655,000	81,477,000
Loss from operations	(2,096,000)	(37,303,000)
Other income (expense):
Derivative loss	0	(1,007,000)
Interest expense	(4,568,000)	(14,547,000)
Reorganization items, net (note 3)	(89,003,000)	0
Gain on termination fee (note 2)	0	6,000,000
Other income (loss)	1,391,000	(380,000)
Total other expense	(92,180,000)	(9,934,000)
Loss from operations before taxes	(94,276,000)	(47,237,000)
Income tax benefit (expense)	0	0
Net loss	(94,276,000)	(47,237,000)
Comprehensive loss	$ (94,276,000)	$ (47,237,000)
Basic net loss per common share
Basic net loss per common share (in dollars per share)	$ (1.91)	$ (0.96)
Diluted net loss per common share
Diluted net loss per common share (in dollars per share)	$ (1.91)	$ (0.96)
Basic weighted-average common shares outstanding (in shares)	49,452	49,131
Diluted weighted-average common shares outstanding (in shares)	49,452	49,131