Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net loss	$ (5,948)	$ (7,533)
Adjustments to reconcile net loss to net cash provided by operating activities:
Deferred tax expense (benefit)	144	(274)
Depreciation, depletion and amortization	18,014	21,753
Accretion of asset retirement obligation	282	1,671
Share-based compensation expense	852	1,181
Amortization costs and other	900	561
Non-cash interest expense on PIK Notes	2,961	16,973
Payments to settle asset retirement obligations	(503)	(2,277)
Changes in working capital accounts:
Revenue receivable	8,526	198
Joint interest billing receivable	4,834	1,935
Accounts payable and accrued liabilities	(21,651)	2,292
Advances from co-owners	(1,267)	424
Deposit for surety bonds	(4,400)	0
Other	(879)	(1,576)
Net cash provided by operating activities	1,865	35,328
Cash flows used in investing activities:
Investment in oil and gas properties	(14,727)	(44,941)
Investment in other property and equipment	30	(52)
Sale of oil and gas properties	(2,328)	2,207
Sale of unevaluated oil and gas properties	5,303	0
Net cash used in investing activities	(11,722)	(42,786)
Cash flows provided by (used in) financing activities:
Net proceeds from share based compensation	43	16
Deferred financing costs	(330)	(156)
Redemption of 2017 Notes	0	(22,650)
Costs incurred to redeem 2021 Notes	(11)	0
Proceeds from borrowings	52,500	20,000
Repayment of borrowings	(32,500)	0
Net cash provided by (used in) financing activities	19,702	(2,790)
Net increase (decrease) in cash and cash equivalents	9,845	(10,248)
Cash and cash equivalents, beginning of period	15,655	28,312
Cash and cash equivalents, end of period	25,500	18,064
Cash paid during the period for:
Interest	4,283	5,717
Income taxes	$ 38	$ (95)