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VARIABLE INTEREST ENTITIES - Cavalier (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 03, 2019
Variable Interest Entities
Contributions			$ 2,142
Distributions paid to Partners	$ 51,753	$ 278,425	$ 275,902
Cavalier Minerals | Alliance Minerals
Variable Interest Entities
Contributions	143,112
Distributions paid to Partners	89,380
Cavalier Minerals | Bluegrass Minerals
Variable Interest Entities
Contributions	5,963
Distributions paid to Partners	$ 3,723
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%			4.00%

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The incentive distribution of available cash as a percent.

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The distributions of earnings to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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