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INCOME TAXES - Reconciliation of Statutory Income Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
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