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VARIABLE INTEREST ENTITIES - Cavalier (Details) - USD ($) $ in Thousands				9 Months Ended		12 Months Ended
	Aug. 13, 2021	May 14, 2021	Feb. 14, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Variable Interest Entities
Distributions paid to Partners	$ 13,041	$ 13,045	$ 51,753	$ 26,086	$ 51,753	$ 51,753
Cavalier Minerals | Alliance Minerals
Variable Interest Entities
Contributions				143,112
Distributions paid to Partners				104,149
Cavalier Minerals | Bluegrass Minerals
Variable Interest Entities
Contributions				5,963
Distributions paid to Partners				$ 4,339
Cavalier Minerals | Bluegrass Minerals
Variable Interest Entities
Incentive distribution of available cash (as a percent)				25.00%
Cavalier Minerals
Variable Interest Entities
Ownership interest in VIE (as a percent)				96.00%
Cavalier Minerals | Bluegrass Minerals
Variable Interest Entities
Noncontrolling ownership interest (as a percent)				4.00%

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