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INVESTMENT - AllDale (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
ASSETS
Beginning balance			$ 27,268
Equity method investment income	$ 341	$ 137	403	$ 588
Ending balance	26,274		26,274
All Dale Minerals III
ASSETS
Beginning balance	26,907	28,114	27,268	28,529
Equity method investment income	341	137	403	588
Distributions received	(974)	(546)	(1,397)	(1,139)
Other				(273)
Ending balance	$ 26,274	$ 27,705	$ 26,274	$ 27,705

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