REPORTING SEGMENTS AND RELATED INFORMATION - Revenue Components of Mineral Resources Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue from External Customer [Line Items]
Total expenses	$ 20,487	$ 16,177	$ 47,882	$ 42,398
Operating results	10,988	(1,215)	13,882	256
Operating Segments
Revenue from External Customer [Line Items]
Total revenues	31,475	14,962	61,764	42,654
Mineral resources | Operating Segments
Revenue from External Customer [Line Items]
Total revenues	3,139	4,774	19,238	19,354
Total expenses	1,745	3,025	11,347	12,325
Operating results	$ 1,394	$ 1,749	$ 7,891	$ 7,029