Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income (loss)	$ (11,858)	$ 26,127	$ (11,053)	$ 7,220
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, depletion and amortization	28,538	14,079	76,096	42,281
Impairment of proved and unproved oil and gas properties		0	44,928	0
Impairment of goodwill	0	0	17,620	0
Accretion of asset retirement obligations	47	52	137	160
Settlement of asset retirement obligations			0	(179)
(Gain) loss on sale of oil and gas properties	0	120	(198)	446
Total (gain) loss on derivative contracts, net	6,040	(18,726)	(73,065)	19,672
Operating portion of net cash received in settlement of derivative contracts			47,599	13,660
Stock-based compensation			7,665	6,680
Deferred income taxes			112	728
Amortization of deferred financing costs	100	100	241	336
Changes in assets and liabilities:
(Increase) decrease in accounts receivable			12,102	(5,585)
(Increase) decrease in prepaid expenses and other current assets			(264)	(28)
Increase (decrease) in accounts payable and accrued expenses			1,976	(8,330)
Increase (decrease) in revenues and royalties payable			(7,768)	(9,042)
Increase (decrease) in advances			(11,412)	17,720
Net cash provided by operating activities			104,716	85,739
Cash flows from investing activities:
Additions to oil and gas properties			(72,869)	(120,685)
Additions to office and other equipment			(111)	(379)
Proceeds from sales of oil and gas properties			409	2
Net cash used in investing activities			(72,571)	(121,062)
Cash flows from financing activities:
Proceeds from borrowings			93,923	165,272
Repayments of borrowings			(133,923)	(119,099)
Cash paid related to the exchange and cancellation of Class A Common Stock			(531)	(827)
Cash paid for finance leases			(125)	(355)
Deferred financing costs			0	(228)
Net cash (used in) provided by financing activities			(40,656)	44,763
Net (decrease) increase in cash			(8,511)	9,440
Cash at beginning of period			13,822	376
Cash at end of period	$ 5,311	$ 9,816	5,311	9,816
Cash paid for:
Interest			3,613	4,235
Non-cash investing and financing activities:
Accrued capital expenditures			2,213	50,615
Lease asset additions - ASC 842			0	4,710
Asset retirement obligations			$ 44	$ 43