Consolidated and Combined Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	$ 21,639	$ 32,815	$ 115,612
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	30,940	13,915	6,955
Share-based compensation expense	10,049	0	0
Loss on extinguishment of debt	6,892	0	0
Amortization of debt issue costs	433	690	121
Deferred income taxes	665	237	295
Loss (gain) on derivative instruments, net	568	(424)	121
Net cash received (paid) for derivative settlements	470	(754)	0
(Gain) loss on sale and distribution of equity securities	0	(823)	4,222
Bad debt expense	669	382	0
(Gain) on sale of oil and gas properties	0	0	(94,551)
Changes in operating assets and liabilities:
(Increase)/Decrease in accounts receivable	(10,246)	(8,022)	(6,787)
(Increase)/Decrease in other current assets	1,787	(6,116)	(44)
Increase/(Decrease) in accounts payable and accrued liabilities	5,112	(484)	3,956
Increase/(Decrease) in other long-term liabilities	47	28	0
Other operating	0	0	(499)
Net cash provided by (used in) operating activities	69,025	31,444	29,401
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to oil and gas properties	(219,481)	(195,603)	(101,437)
Additions to other fixed assets	(474)	(723)	(1,311)
Proceeds from sale of oil and gas properties, net	3,123	125	111,024
Proceeds from sale of equity securities	0	933	17,896
Net cash provided by (used in) investing activities	(216,832)	(195,268)	26,172
CASH FLOWS FROM FINANCING ACTIVITIES
Payments of short-term related party loan	0	(7,000)	0
Borrowing of short-term related party loan	0	7,000	0
Payments of short-term debt	(4,596)	0	0
Payments of long-term debt	(275,404)	(70,000)	(15,000)
Borrowing of long-term debt	105,000	218,000	27,000
Payment of debt extinguishment fees	(2,091)	0	0
Proceeds from issuance of Class A common stock sold in initial public offering, net of offering costs	277,075	0	0
Proceeds from issuance of Class A common stock, net of offering costs	102,680	0	0
Capital contributions	0	46,011	37,000
Capital distributions	(441)	0	(131,544)
Dividends paid	(14,663)	0	0
Distributions to holders of temporary equity	(19,731)	0	0
Loan closing costs	(1,348)	(4,614)	(103)
Net cash provided by (used in) financing activities	166,481	189,397	(82,647)
Increase/Decrease in cash, cash equivalents and restricted cash	18,674	25,573	(27,074)
Cash, cash equivalents and restricted cash, beginning of period	32,459	6,886	33,960
Cash, cash equivalents and restricted cash end of period	51,133	32,459	6,886
Supplemental disclosure of non-cash activity:
Equity securities received	0	0	45,633
Equity securities distributed	0	3,313	(20,092)
Accrued capital expenditures	63	1,426	73
Vesting of A-M units	0	0	600
Capitalized share-based compensation cost	3,818	0	0
Temporary equity cumulative adjustment to fair value	51,572	0	0
Supplemental cash flow information:
Cash paid for interest	6,192	6,123	458
Cash paid for taxes	$ 832	$ 604	$ 2