Oil and Natural Gas Interests (Tables)

12 Months Ended

Dec. 31, 2020

Oil And Gas Exploration And Production Industries Disclosures [Abstract]

Schedule of oil and natural gas interest

Oil and natural gas interest include the following (in thousands):

	As of
	December 31,			December 31,
	2020			2019
Oil and natural gas interests:
Subject to depletion	$	319,487		$	311,954
Not subject to depletion		32,463			37,580
Gross oil and natural gas interests		351,950			349,534
Accumulated depletion and impairment		(144,445	)		(130,342	)
Oil and natural gas interests, net	$	207,505		$	219,192

Aggregate capitalized costs related to oil and natural gas production activities with applicable accumulated depreciation, depletion and amortization are as follows:

	As of December 31,
	2020			2019
	(in thousands)
Proved royalty interest	$	319,487		$	311,954
Unproved royalty interests		32,463			37,580
Accumulated amortization		(144,445	)		(130,342	)
Net royalty interests in oil and natural gas properties	$	207,505		$	219,192