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INVESTMENTS - AllDale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Beginning balance	$ 28,529
Equity method investment income	907	$ 2,203	$ 22,189
Ending balance	27,268	28,529
All Dale Minerals III
ASSETS
Beginning balance	28,529	28,974	14,182
Contributions			15,600
Equity method investment income	907	2,203	547
Distributions received	(1,895)	(2,648)	(1,355)
Other	(273)
Ending balance	$ 27,268	$ 28,529	$ 28,974

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