Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Operating activities
Net loss	$ (94,335)	$ (27,333)
Adjustments to reconcile net loss to net cash provided by operating activities:
Loss on disposal of oil and gas properties	35	629
Accretion of asset retirement obligations	180	214
Depletion, depreciation, and amortization	46,888	58,828
Stock-based compensation	448	2,585
Deferred taxes	27,059	(15,497)
Loss (gain) on derivative financial instruments	8,672	(27,609)
Settlements of derivative financial instruments	29,790	35,284
Gain on redemption of bonds	(28,480)
Impairment of oil and gas properties	33,893	28,623
Non-cash interest expense	7,581	1,100
Unrealized gain on warrants	(568)
Changes in operating assets and liabilities:
Accounts receivable	234	10,857
Prepaid expenses and other assets	(1,856)	223
Accounts payable and accrued expenses	(5,272)	(17,065)
Net cash provided by operating activities	24,269	50,839
Investing activities
Acquisition of oil and gas properties	(4,340)	(8,723)
Development of oil and gas properties	(39,382)	(85,458)
Proceeds from sales of oil and gas properties	16,174
Purchases of other property and equipment	(233)	(337)
Net cash used in investing activities	(27,781)	(94,518)
Financing activities
Proceeds from borrowings and related party borrowings	72,063	140,514
Payments on borrowings and related party borrowings	(134,697)	(102,514)
Proceeds from sale of common stock, net of offering costs	72,807
Payments of debt issuance\settlement costs	(4,912)
Payments on other notes payable	(3)	(3)
Net cash provided by financing activities	5,258	37,997
Effect of exchange rate changes on cash and cash equivalents		12
Increase (decrease) in cash and cash equivalents	1,746	(5,670)
Cash and cash equivalents, beginning of the period	4,322	9,992
Cash and cash equivalents, end of the period	$ 6,068	$ 4,322