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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

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- Definition Amount of interest expense on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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