Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities
Net income (loss)	$ 3,066	$ (11,297)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Accretion of asset retirement obligations	20	56
Depletion, depreciation, and amortization	12,122	15,139
Stock-based compensation	178	95
Deferred taxes	1,591	(5,868)
Gain on derivative financial instruments	(8,746)	(1,716)
Settlements of derivative financial instruments	1,516	10,636
Impairment of oil and gas properties		23
Non-cash interest expense	581	275
Unrealized gain on warrants	(2,270)
Changes in operating assets and liabilities:
Accounts receivable	(2,110)	688
Prepaid expenses and other assets	(378)	(104)
Accounts payable and accrued expenses	7,398	9,788
Net cash provided by operating activities	12,968	17,715
Investing activities
Acquisition of oil and gas properties	(1,563)	(2,065)
Development of oil and gas properties	(19,076)	(14,587)
Purchases of other property and equipment	(13)	(176)
Net cash used in investing activities	(20,652)	(16,828)
Financing activities
Proceeds from borrowings and related party borrowings	9,000	7,000
Payments on borrowings and related party borrowings	(2,500)	(8,000)
Cost to issue equity	(1,000)
Changes in other notes payable		(21)
Net cash provided by (used in) financing activities	5,500	(1,021)
Effect of exchange rate changes on cash and cash equivalents		1
Decrease in cash and cash equivalents	(2,184)	(133)
Cash and cash equivalents, beginning of the period	6,068	4,321
Cash and cash equivalents, end of the period	3,884	4,188
Supplemental information:
Cash paid for interest expense	$ 912	$ 705