Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Oil and gas sales	$ 20,772	$ 17,320
Expenses:
Lease operating expenses	7,076	8,177
Production taxes	308	338
Depreciation, depletion and amortization	6,117	10,138
Ceiling test write-down	0	18,857
General and administrative	3,153	8,599
Accretion of asset retirement obligation	547	608
Interest expense	7,258	8,257
Expenses	24,459	54,974
Other income:
Other income	54	97
Loss from operations	(3,633)	(37,557)
Income tax expense	0	86
Net loss	(3,633)	(37,643)
Preferred stock dividend	1,285	1,494
Loss available to common stockholders	$ (4,918)	$ (39,137)
Basic
Net income (loss) per share (in usd per share)	$ (0.23)	$ (2.31)
Diluted
Net income (loss) per share (in usd per share)	$ (0.23)	$ (2.31)
Weighted average number of common shares:
Basic (shares)	21,208	16,956
Diluted (shares)	21,208	16,956