SUPPLEMENTAL BALANCE SHEET AND CASH FLOW INFORMATION - Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Prepaid expenses:
Electric deposits	$ 3,500	$ 1,400
Prepaid insurance	3,798	3,822
Other	719	1,044
Total	8,017	6,266
Accrued expenses:
Accrued interest	1,530	1,741
Accrued compensation	2,164	1,535
Accrued non-income taxes	1,371	1,932
Other	2,951	6,119
Total	$ 8,016	$ 11,327