Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net loss	$ (7,533)	$ (82,522)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Deferred tax (benefit) expense	(274)	543
Depreciation, depletion and amortization	21,753	23,361
Ceiling test writedown	0	40,304
Accretion of asset retirement obligation	1,671	1,896
Share-based compensation expense	1,181	1,361
Amortization costs and other	561	1,990
Non-cash interest expense on PIK Notes	16,973	0
Payments to settle asset retirement obligations	(2,277)	(2,884)
Costs incurred to issue 2021 Notes	0	10,073
Changes in working capital accounts:
Revenue receivable	198	(5,374)
Joint interest billing receivable	1,935	26,800
Accounts payable and accrued liabilities	2,292	(45,904)
Advances from co-owners	424	(15,741)
Other	(1,576)	(5,640)
Net cash provided by (used in) operating activities	35,328	(51,737)
Cash flows (used in) provided by investing activities:
Investment in oil and gas properties	(44,941)	(22,084)
Investment in other property and equipment	(52)	(23)
Sale of oil and gas properties	2,207	24,832
Net cash (used in) provided by investing activities	(42,786)	2,725
Cash flows used in financing activities:
Net proceeds from share based compensation	16	130
Deferred financing costs	(156)	(373)
Payment of preferred stock dividend	0	(1,285)
Redemption of 2017 Notes	(22,650)	(53,626)
Costs incurred to issue 2021 Notes	0	(10,073)
Proceeds from borrowings	20,000	0
Net cash used in financing activities	(2,790)	(65,227)
Net decrease in cash and cash equivalents	(10,248)	(114,239)
Cash and cash equivalents, beginning of period	28,312	148,013
Cash and cash equivalents, end of period	18,064	33,774
Cash paid during the period for:
Interest	5,717	33,114
Income taxes	$ (95)	$ (18)