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INCOME TAXES - Reconciliation of Statutory Income Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Statutory income tax $ 22,858 $ 16,965 $ 17,105
Increase (reduction) in taxes due to:      
State income taxes net of federal tax benefit 7,598 5,639 5,685
Effect of regulatory treatment of fixed asset differences (9,201) (3,696) (5,954)
Investment tax credits (74) (74) (74)
AFUDC equity (1,392) (1,870) (1,106)
Share based stock compensation 523 302 (278)
TCJA refund (9,470) 0 0
Other 1,176 405 494
Total income tax $ 12,018 $ 17,671 $ 15,872