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VARIABLE INTEREST ENTITIES - Cavalier (Details) - USD ($) $ in Thousands						9 Months Ended		12 Months Ended
	Feb. 14, 2020	Nov. 14, 2019	Aug. 14, 2019	May 15, 2019	Feb. 14, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Variable Interest Entities
Distributions paid to Partners	$ 51,753	$ 69,772	$ 70,153	$ 69,489	$ 69,011	$ 51,753	$ 208,653	$ 278,425
Cavalier Minerals | Alliance Minerals
Variable Interest Entities
Contributions						143,112
Distributions paid to Partners						86,384
Cavalier Minerals | Bluegrass Minerals
Variable Interest Entities
Contributions						5,963
Distributions paid to Partners						$ 3,598
Cavalier Minerals | Bluegrass Minerals
Variable Interest Entities
Incentive distribution of available cash (as a percent)						25.00%
Cavalier Minerals | Bluegrass Minerals
Variable Interest Entities
Noncontrolling ownership interest (as a percent)						4.00%
Cavalier Minerals | Alliance Minerals
Variable Interest Entities
Ownership interest in VIE (as a percent)						96.00%

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