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INCOME TAXES - Reconciliation of Statutory Income Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Statutory income tax | $ 9,365 | $ 21,344 | $ 22,065
Increase (reduction) in taxes due to: |  |  |
State income taxes net of federal tax benefit | 3,718 | 7,383 | 7,334
Effect of regulatory treatment of fixed asset differences | (9,478) | (6,274) | (6,327)
Investment tax credits | (74) | (74) | (74)
AFUDC equity | (1,553) | (1,155) | (891)
Stock based stock compensation | 677 | 455 | 791
TCJA refund | (11,618) | (13,919) | (19,417)
Other | 2,182 | (1,385) | 611
Total income tax | $ (6,781) | $ 6,375 | $ 4,092

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