CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Activities
Net income (loss)	$ 20,115	$ (91,077)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Gain on sale of non-oil and gas assets	(102)	(374)
Net (gain) loss on derivative contracts	(10,375)	10,346
Derivative contract settlements	3,416	3,187
Monetization of derivative contracts	0	14,370
Depreciation, depletion, and amortization	17,666	17,932
Proved property impairment	0	67,626
Amortization of deferred financing fees	354	763
Accretion of future site restoration	338	381
Stock-based compensation	2,499	2,410
Non-cash director compensation	0	40
Changes in operating assets and liabilities:
Accounts receivable	(2,957)	(2,651)
Other assets	(812)	1,454
Accounts payable and accrued expenses	(7,883)	(2,182)
Net cash provided by operating activities	22,259	22,225
Investing Activities
Capital expenditures, including purchases and development of properties	(71,518)	(24,632)
Proceeds from the sale of oil and gas properties	15,098	13,571
Proceeds from the sale of non-oil and gas assets	204	4,022
Net cash used in by investing activities	(56,216)	(7,039)
Financing Activities
Proceeds from long-term borrowings	60,000	14,000
Payments on long-term borrowings	(89,722)	(59,739)
Proceeds from issuance of common stock	65,224	27,135
Deferred financing fees	(726)	(171)
Exercise of stock options	0	49
Net cash (used in) provided by financing activities	34,776	(18,726)
Increase (decrease) in cash and cash equivalents	819	(3,540)
Cash and cash equivalents at beginning of period	0	3,540
Cash and cash equivalents at end of period	819	0
Supplemental disclosure of cash flow information:
Interest paid	1,427	3,395
Non-cash investing and financing activities
Issuance of stock for acquisition of oil and gas properties	3,335	0
Change in capital expenditures included in accounts payable	16,510	0
Non-cash investing and financing activities	$ 19,845	$ 0