CONTINGENCIES AND COMMITMENTS - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Operating leases
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other	Other
Other assets: Other	$ 13,301	$ 13,387
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other accrued liabilities	Other accrued liabilities
Other accrued liabilities	$ 1,218	$ 962
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other long-term liabilities	Other long-term liabilities
Other long-term liabilities	$ 12,285	$ 12,605
Total	13,503	13,567
Finance leases
Depreciable plant and equipment	18,761	19,087
Accumulated depreciation and amortization	(16,102)	(14,339)
Net utility plant	$ 2,659	$ 4,748
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Long-term debt, net	Long-term debt, net
Current maturities of long-term debt, net	$ 2,099	$ 844
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term debt, net	Long-term debt, net
Long-term debt, net	$ 688	$ 3,057
Total finance lease liabilities	$ 2,787	$ 3,901
Weighted average remaining lease term
Operating leases	100 months	112 months
Finance leases	17 months	29 months
Weighted average discount rate
Operating leases	3.80%	3.60%
Finance leases	5.60%	5.50%