Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net loss	$ (20,096)	$ (24,142)
Adjustments to reconcile net loss to net cash provided by operating activities:
Gain on disposal of oil and gas properties		(919)
Accretion of asset retirement obligations	58	107
Depletion, depreciation, and amortization	24,635	27,636
Stock-based compensation	639	191
Deferred taxes	(10,985)	(12,129)
(Gain) losses on derivative financial instruments	(14,162)	5,069
Settlements of derivative financial instruments	2,682	18,300
Impairment of oil and gas properties	27,081	1,938
Non-cash interest expense	3,434	550
Unrealized gain on warrants	(2,884)
Changes in operating assets and liabilities:
Accounts receivable	(1,308)	(818)
Prepaid expenses and other assets	(3,010)	229
Accounts payable and accrued expenses	11,028	(8,479)
Net cash provided by operating activities	17,112	7,533
Investing activities
Acquisition of oil and gas properties	(108,179)	(2,717)
Development of oil and gas properties	(37,750)	(19,003)
Proceeds from sales of oil and gas properties		2,720
Purchases of other property and equipment	(1,522)	(177)
Net cash used in investing activities	(147,451)	(19,177)
Financing activities
Proceeds from borrowings and related party borrowings	76,079	23,500
Payments on borrowings and related party borrowings	(19,500)	(11,000)
Proceeds from sale of preferred stock	77,800
Cost to issue equity	(1,000)	(15)
Payments of debt issuance costs	(2,537)
Changes in other notes payable	(3)
Net cash provided by financing activities	130,839	12,485
Effect of exchange rate changes on cash and cash equivalents		(16)
Increase in cash and cash equivalents	500	825
Cash and cash equivalents, beginning of the period	6,068	4,322
Cash and cash equivalents, end of the period	6,568	5,147
Net cash used by operating activities:
Cash paid for taxes	2,240
Cash paid for interest expense	10,674	$ 11,082
Non-cash investing and financing activities:
Preferred stock issued for asset acquisition	10,795
Cost to issue equity included in accounts payable	$ 1,500