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VARIABLE INTEREST ENTITIES - Cavalier (Details) - USD ($) $ in Thousands			6 Months Ended		12 Months Ended
	May 14, 2021	Feb. 14, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Variable Interest Entities
Distributions paid to Partners	$ 13,045	$ 51,753	$ 13,045	$ 51,753	$ 51,753
Cavalier Minerals | Alliance Minerals
Variable Interest Entities
Contributions			143,112
Distributions paid to Partners			98,107
Cavalier Minerals | Bluegrass Minerals
Variable Interest Entities
Contributions			5,963
Distributions paid to Partners			$ 4,087
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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