COMMITMENTS AND CONTINGENCIES - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 2,514	$ 2,464
Finance lease cost:
Amortization of right-of-use assets	1,606	1,598
Interest on lease liabilities	246	282
Total finance lease cost	1,852	1,880
Short-term lease cost	2,101	2,079
Variable lease cost	519	415
Total lease cost	6,986	6,838
Depreciable plant and equipment	19,820	19,494
Accumulated depreciation and amortization	(14,017)	(12,411)
Net utility plant	$ 5,803	$ 7,083
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current maturities of long-term debt, net	Current maturities of long-term debt, net
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term debt, net	Long-term debt, net
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other	Other
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other accrued liabilities	Other accrued liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other long-term liabilities	Other long-term liabilities