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VARIABLE INTEREST ENTITIES - Cavalier (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Feb. 14, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Variable Interest Entities
Distributions paid to Partners	$ 51,753		$ 51,753	$ 51,753
Cavalier Minerals | Alliance Minerals
Variable Interest Entities
Contributions		$ 143,112
Distributions paid to Partners		92,780
Cavalier Minerals | Bluegrass Minerals
Variable Interest Entities
Contributions		5,963
Distributions paid to Partners		$ 3,865
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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