Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net (loss) income	$ (10,556)	$ 36,714
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, depletion and amortization	24,407	24,656
Impairment of proved and unproved oil and gas properties	0	42,751
Impairment of goodwill	0	17,620
Accretion of asset retirement obligations	290	44
Settlement of asset retirement obligations	(15)	0
(Gain) on sale of oil and gas properties	0	(204)
Total loss (gain) on derivative contracts, net	33,263	(99,784)
Operating portion of net cash (paid) received in settlement of derivative contracts	(10,905)	9,739
Stock-based compensation	3,329	2,694
Deferred income taxes	(308)	1,092
Amortization of deferred financing costs	141	80
Changes in assets and liabilities:
(Increase) decrease in accounts receivable	(5,379)	13,780
(Increase) decrease in prepaid expenses and other current assets	367	(312)
Increase (decrease) in accounts payable and accrued expenses	5,389	2,846
Increase (decrease) in revenues and royalties payable	(2,081)	5,640
Increase (decrease) in advances	358	(8,814)
Net cash provided by operating activities	38,300	48,542
Cash flows from investing activities:
Acquisition of oil and gas properties, net of cash acquired	(134,641)	0
Additions to oil and gas properties	(8,913)	(39,299)
Additions to office and other equipment	(226)	(87)
Proceeds from sales of oil and gas properties	0	409
Net cash used in investing activities	(143,780)	(38,977)
Cash flows from financing activities:
Proceeds from borrowings	177,114	17,500
Repayments of borrowings	(68,690)	(35,500)
Cash paid related to the exchange and cancellation of Class A Common Stock	(2,080)	(214)
Cash paid for finance leases	(20)	(72)
Deferred financing costs	(891)	0
Net cash provided by (used in) financing activities	105,433	(18,286)
Net decrease in cash	(47)	(8,721)
Cash at beginning of period	1,494	13,822
Cash at end of period	1,447	5,101
Cash paid for:
Interest	1,922	1,676
Non-cash investing and financing activities:
Accrued capital expenditures	7,775	31,011
Asset retirement obligations	$ 427	$ 21