Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating Activities
Net income	$ 3,264	$ 2,002
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on sale of non-oil and gas assets		181
Net loss on derivative contracts	11,358	41,215
Net cash settlements paid on derivative contracts	(2,930)	(16,575)
Depreciation, depletion, amortization and accretion	38,367	30,241
Amortization of deferred financing fees	418	320
Stock-based compensation	1,398	1,894
Settlement of asset retirement obligation	(474)
Changes in operating assets and liabilities:
Accounts receivable	16,367	(14,326)
Other assets	(502)	1,727
Accounts payable and accrued expenses	(6,249)	20,025
Net cash provided by operating activities	61,017	66,704
Investing Activities
Capital expenditures, including purchases and development of properties	(89,621)	(132,989)
Proceeds from the sale of oil and gas properties	16,765	3,116
Proceeds from the sale of non-oil and gas assets		26
Net cash used in investing activities	(72,856)	(129,847)
Financing Activities
Proceeds from long-term borrowings	38,000	93,000
Payments on long-term borrowings	(20,199)	(31,193)
Deferred financing fees	(91)	(296)
Exercise of stock options	401	14
Net cash provided by financing activities	18,111	61,525
Increase (decrease) in cash and cash equivalents	6,272	(1,618)
Cash and cash equivalents at beginning of period	867	1,618
Cash and cash equivalents at end of period	7,139
Supplemental disclosures of cash flow information:
Interest paid	8,706	4,402
Non-cash investing and financing activities
Properties classified as held for sale	7,876
Change in capital expenditures included in accounts payable	(3,445)	(3,823)
Change in asset retirement obligations	$ (379)	$ (1,436)