Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net (loss) income	$ (26,387)	$ 805
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, depletion and amortization	50,434	47,558
Impairment of proved and unproved oil and gas properties	0	42,813
Impairment of goodwill	0	17,620
Accretion of asset retirement obligations	593	90
Settlement of asset retirement obligations	(53)	0
(Gain) on sale of oil and gas properties	(348)	(198)
(Gain) on sale of office and other equipment	(114)	0
Total loss (gain) on derivative contracts, net	84,438	(79,105)
Operating portion of net cash (paid) received in settlement of derivative contracts	(25,427)	39,096
Stock-based compensation	7,741	5,262
Deferred income taxes	(794)	(18)
Amortization of deferred financing costs	339	161
Changes in assets and liabilities:
(Increase) decrease in accounts receivable	(4,181)	15,060
(Increase) decrease in prepaid expenses and other current assets	(114)	(747)
Increase (decrease) in accounts payable and accrued expenses	8,352	(3,410)
Increase (decrease) in revenues and royalties payable	1,795	(16,491)
Increase (decrease) in advances	(2,830)	(11,412)
Net cash provided by operating activities	93,444	57,084
Cash flows from investing activities:
Acquisition of oil and gas properties, net of cash acquired	(187,803)	0
Additions to oil and gas properties	(28,238)	(67,493)
Additions to office and other equipment	(370)	(108)
Proceeds from sales of oil and gas properties	200	409
Net cash used in investing activities	(216,211)	(67,192)
Cash flows from financing activities:
Proceeds from borrowings	360,078	69,906
Repayments of borrowings	(233,718)	(71,318)
Cash paid related to the exchange and cancellation of Class A Common Stock	(2,821)	(382)
Cash paid for finance leases	(70)	(110)
Deferred financing costs	(1,718)	0
Net cash provided by (used in) financing activities	121,751	(1,904)
Net decrease in cash	(1,016)	(12,012)
Cash at beginning of period	1,494	13,822
Cash at end of period	478	1,810
Cash paid for:
Interest	4,272	2,659
Income taxes	797	0
Non-cash investing and financing activities:
Class A Common Stock issued in IRM Acquisition	76,572	0
Accrued capital expenditures	11,416	6,220
Asset retirement obligations	$ 161	$ 43