Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 448	$ (5,324)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	10,046	3,452
Right of use asset depreciation	285
Loss on commodity derivatives not designated as hedges	1,008	981
Net cash paid in settlement of derivative instruments	(1,760)	(384)
Share-based compensation (non-cash)	1,568	1,675
Amortization of finance cost, debt discount, paid in-kind interest and accretion	3,193	2,501
Reorganization items (non-cash) and other	12	331
Change in assets and liabilities:
Accounts receivable, trade and other, net of allowance	(656)	(1,165)
Accrued oil and natural gas revenue	2,236	(828)
Prepaid expenses and other	35	(108)
Accounts payable	2,641	6,848
Accrued liabilities	(1,149)	(1,723)
Net cash provided by operating activities	17,907	6,256
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(28,254)	(28,990)
Proceeds from sale of assets	1,284	23,209
Net cash used in investing activities	(26,970)	(5,781)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments of bank borrowings	(2,000)	(16,723)
Proceeds from bank borrowings	7,000
Issuance cost, net		(10)
Purchase of treasury stock	(5)	(3)
Net cash provided by (used in) financing activities	4,995	(16,736)
Decrease in cash and cash equivalents	(4,068)	(16,261)
Cash and cash equivalents, beginning of period	4,068	25,992
Cash and cash equivalents, end of period		9,731
Supplemental disclosures of cash flow information:
Cash paid for reorganization items, net		81
Cash paid for interest	505	175
Increase (decrease) in non-cash capital expenditures	$ 1,059	$ (8,360)