Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Activities
Net income (loss)	$ 41,443	$ (25,455)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Net (gain) loss on derivative contracts	(75,730)	29,075
Net cash settlements paid on derivative contracts	1,713	(311)
Depreciation, depletion and amortization	9,176	13,463
Proved property impairment	26,659
Accretion expense	103	111
Amortization of deferred financing fees and issuance discount	470	121
Stock-based compensation	230	373
Settlement of asset retirement obligation		(386)
Changes in operating assets and liabilities:
Accounts receivable	8,113	10,110
Other assets	(3,502)	84
Accounts payable and accrued expenses	(5,023)	1,010
Net cash provided by operating activities	3,652	28,195
Investing Activities
Capital expenditures, including purchases and development of properties	(9,549)	(28,008)
Proceeds from the sale of oil and gas properties		992
Net cash used in investing activities	(9,549)	(27,016)
Financing Activities
Proceeds from long-term borrowings	8,000	3,000
Payments on long-term borrowings	(2,069)	(4,066)
Deferred financing fees	(34)	(56)
Exercise of stock options		401
Net cash provided by (used in) financing activities	5,897	(721)
Increase (decrease) in cash and cash equivalents		458
Cash and cash equivalents at beginning of period		867
Cash and cash equivalents at end of period		1,325
Supplemental disclosures of cash flow information:
Interest paid	4,050	2,939
Non-cash investing and financing activities
Change in capital expenditures included in accounts payable	(4,914)	1,822
Change in asset retirement obligations		$ 85