ACQUISITIONS - 2019 Activity (Details) shares in Thousands, $ in Thousands			12 Months Ended
	Oct. 31, 2019 USD ($) a shares	Oct. 01, 2019 USD ($) a shares	Dec. 31, 2019 USD ($) a
2019 Drop-Down Transaction
Business Acquisition [Line Items]
Number of shares to be issued in acquisition (in shares) | shares		18,300
Fair value consideration of units issued in acquisition | $		$ 497,200
Payments to acquire | $		$ 190,200
Net royalty area (in acre) | a		5,490
Percentage of mineral acres operated		95.00%
Percentage of average net royalty interest in acquired mineral and royalty interests		3.20%
2019 Drop-Down Transaction | Class B Units
Business Acquisition [Line Items]
Number of shares to be issued in acquisition (in shares) | shares		18,300
Santa Elena Acquisition
Business Acquisition [Line Items]
Fair value consideration of units issued in acquisition | $	$ 124,000
Net royalty area (in acre) | a	1,366
Percentage of mineral acres operated	5.60%
Santa Elena Acquisition | Limited Partner
Business Acquisition [Line Items]
Number of shares to be issued in acquisition (in shares) | shares	5,200
Other Recent Acquisitions
Business Acquisition [Line Items]
Net royalty area (in acre) | a			2,607
Mineral interests acquired, gross acres (in acre) | a			136,012
Aggregate purchase price | $			$ 343,700