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INVESTMENTS - AllDale (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Changes in equity method investment
Beginning balance			$ 28,529
Equity method investment income	$ 62	$ 659	650	$ 1,533
Ending balance	27,415		27,415
All Dale Minerals III
Changes in equity method investment
Beginning balance	27,705	28,672	28,529	28,974
Equity method investment income	62	659	650	1,533
Distributions received	(352)	(610)	(1,491)	(1,786)
Other			(273)
Ending balance	$ 27,415	$ 28,721	$ 27,415	$ 28,721

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