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INVESTMENT - AllDale (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
ASSETS
Beginning balance	$ 27,268
Equity method investment income	62	$ 451
Ending balance	26,907
All Dale Minerals III
ASSETS
Beginning balance	27,268	28,529
Equity method investment income	62	451
Distributions received	(423)	(593)
Other		(273)
Ending balance	$ 26,907	$ 28,114

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