Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 26,127,000	$ 564,000	$ 7,220,000	$ 14,227,000
Adjustments to reconcile net income to net cash provided by operating activities:
Impairment expense	0	833,000	0	833,000
Depreciation, depletion and amortization	14,079,000	12,842,000	42,281,000	33,362,000
Accretion of asset retirement obligations	52,000	44,000	160,000	128,000
Settlement of asset retirement obligations			(179,000)	(79,000)
Loss (gain) on sale of oil and gas properties	120,000	(4,096,000)	446,000	(4,608,000)
Total loss on derivative contracts, net	(18,726,000)	17,481,000	19,672,000	33,606,000
Operating portion of net cash received (paid) in settlement of derivative contracts			13,660,000	(13,643,000)
Stock-based compensation			6,680,000	5,535,000
Deferred income taxes			728,000	119,000
Amortization of deferred financing costs	100,000	100,000	336,000	228,000
Changes in assets and liabilities:
(Increase) decrease in accounts receivable			(5,585,000)	(1,476,000)
(Increase) decrease in prepaid expenses and other current assets			(28,000)	(372,000)
Increase (decrease) in accounts payable and accrued expenses			(8,330,000)	3,939,000
Increase (decrease) in revenues and royalties payable			(9,042,000)	26,572,000
Increase (decrease) in advances			17,720,000	(1,816,000)
Net cash provided by operating activities			85,739,000	96,555,000
Cash flows from investing activities:
Additions to oil and gas properties			(120,685,000)	(120,124,000)
Additions to office and other equipment			(379,000)	(121,000)
Proceeds from sales of oil and gas properties			2,000	5,840,000
Net cash used in investing activities			(121,062,000)	(114,405,000)
Cash flows from financing activities:
Proceeds from borrowings			165,272,000	70,308,000
Repayments of borrowings			(119,099,000)	(60,308,000)
Cash paid related to the exchange and cancellation of Class A Common Stock			(827,000)	(1,402,000)
Cash paid for finance leases	(100,000)		(355,000)	0
Deferred financing costs			(228,000)	(274,000)
Net cash provided by financing activities			44,763,000	8,324,000
Net increase (decrease) in cash			9,440,000	(9,526,000)
Cash at beginning of period			376,000	22,955,000
Cash at end of period	$ 9,816,000	$ 13,429,000	9,816,000	13,429,000
Cash paid for:
Interest			4,235,000	1,480,000
Non-cash investing and financing activities:
Accrued capital expenditures			50,615,000	11,314,000
Lease asset additions - ASC 842			4,710,000
Asset retirement obligations			$ 43,000	$ (120,000)