Restatement of Previously Issued Consolidated Financial Statements - Consolidated Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flow from operating activities:
Net income	$ 10,448	$ 36,983	$ 128,907
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Gain on sale of assets			(41,382)
Unrealized (gain) loss on commodity derivative instruments	944		1,151
Change in fair value of warrant liability	(5,128)	(6,069)	(27,800)
Amortization of royalty interests in oil and natural gas properties	14,103	12,737	18,536
Amortization of right-of-use assets	492
Accretion of asset retirement obligation			7
Amortization of debt issuance costs	658	643	457
Deferred rent		473
Depreciation of property and equipment	104	75
Share based compensation	3,480	2,548
Deferred income taxes	579	2,421	2,285
Cash paid to settle derivatives			(1,151)
Changes in operating assets and liabilities
Accounts receivable	2,470	3,383	1,882
Prepaid expenses	416	342	(278)
Other assets		10	(182)
Accounts payable and accrued expenses	(553)	1,683	(4,399)
Other liabilities	(579)		(147)
Net cash provided by operating activities	27,434	55,229	77,886
Cash flows from investing activities:
Additions to oil and natural gas properties			(523)
Cash acquired in the Transactions			2,920
Proceeds from the sale of assets			121,130
Acquisition of oil and natural gas properties	(2,417)	(22,761)	(1,215)
Purchase of property and equipment	(14)	(592)
Net cash provided by (used in) investing activities	(2,431)	(23,353)	122,312
Cash flows from financing activities:
Distributions to partners			(143,788)
Distribution of subsidiaries			(7,125)
Contributions			(8)
Proceeds from long-term debt	10,800	39,000
Repayments of long-term debt	(13,500)	(17,500)	(44,000)
Deferred financing fees	(88)
Dividends paid	(11,734)	(30,293)	(4,356)
Distributions to non-controlling interests	(10,200)	(27,703)	(4,101)
Dividend equivalent rights paid	(100)	(154)
Net cash used in financing activities	(24,822)	(36,650)	(203,378)
Net increase (decrease) in cash and cash equivalents	181	(4,774)	(3,180)
Cash and cash equivalents, beginning of period	2,543	7,317	10,497
Cash and cash equivalents, end of period	2,724	2,543	7,317
Supplemental disclosure of cash flow information:
Cash paid for interest	1,539	1,846	1,834
Cash paid for income taxes		1,260	1,350
Non-cash investing and financing activities:
Accrued bonus paid in stock	112
Right-of-use assets obtained in exchange for operating leases	1,547
Initial valuation of warrants related to the Transactions			42,500
Credit facility prior to the Transactions			38,000
Distribution of long-term debt to non-acquired entities prior to the Transactions			31,000
Deferred financing fees prior to the Transactions			3,214
Deferred tax asset related to the Transactions			60,603
As Previously Reported [Member]
Cash flow from operating activities:
Net income	5,320	30,914	101,107
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Gain on sale of assets			(41,382)
Unrealized (gain) loss on commodity derivative instruments	944		1,151
Amortization of royalty interests in oil and natural gas properties	14,103	12,737	18,536
Amortization of right-of-use assets	492
Accretion of asset retirement obligation			7
Amortization of debt issuance costs	658	643	457
Deferred rent		473
Depreciation of property and equipment	104	75
Share based compensation	3,480	2,548
Deferred income taxes	579	2,421	2,285
Cash paid to settle derivatives			(1,151)
Changes in operating assets and liabilities
Accounts receivable	2,470	3,383	1,882
Prepaid expenses	416	342	(278)
Other assets		10	(182)
Accounts payable and accrued expenses	(553)	1,683	(4,399)
Other liabilities	(579)		(147)
Net cash provided by operating activities	27,434	55,229	77,886
Cash flows from investing activities:
Additions to oil and natural gas properties			(523)
Cash acquired in the Transactions			2,920
Proceeds from the sale of assets			121,130
Acquisition of oil and natural gas properties	(2,417)	(22,761)	(1,215)
Purchase of property and equipment	(14)	(592)
Net cash provided by (used in) investing activities	(2,431)	(23,353)	122,312
Cash flows from financing activities:
Distributions to partners			(143,788)
Distribution of subsidiaries			(7,125)
Contributions			(8)
Proceeds from long-term debt	10,800	39,000
Repayments of long-term debt	(13,500)	(17,500)	(44,000)
Deferred financing fees	(88)
Dividends paid	(11,734)	(30,293)	(4,356)
Distributions to non-controlling interests	(10,200)	(27,703)	(4,101)
Dividend equivalent rights paid	(100)	(154)
Net cash used in financing activities	(24,822)	(36,650)	(203,378)
Net increase (decrease) in cash and cash equivalents	181	(4,774)	(3,180)
Cash and cash equivalents, beginning of period	2,543	7,317	10,497
Cash and cash equivalents, end of period	2,724	2,543	7,317
Supplemental disclosure of cash flow information:
Cash paid for interest	1,539	1,846	1,834
Cash paid for income taxes		1,260	1,350
Non-cash investing and financing activities:
Accrued bonus paid in stock	112
Right-of-use assets obtained in exchange for operating leases	1,547
Credit facility prior to the Transactions			38,000
Distribution of long-term debt to non-acquired entities prior to the Transactions			31,000
Deferred financing fees prior to the Transactions			3,214
Deferred tax asset related to the Transactions			60,603
Adjustments [Member]
Cash flow from operating activities:
Net income	5,128	6,069	27,800
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Change in fair value of warrant liability	$ (5,128)	$ (6,069)	(27,800)
Non-cash investing and financing activities:
Initial valuation of warrants related to the Transactions			$ 42,500