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INCOME TAXES (Details 2) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income taxes        
Income tax deductions   $ 70,000,000.0 $ 102,000,000.0 $ 85,900,000
Valuation allowance   0    
Provisional estimate $ 108,000,000.0      
TCJA refund     121,000,000.0  
TCJA gross up     47,000,000.0  
TCJA regulatory liabilities     168,000,000.0  
Unrecognized tax benefits that would impact effective tax rate   3,100,000    
Reconciliation of the income tax expense computed by applying the current federal tax rate to pretax book income and the amount shown in the Consolidated Statements of Income        
Statutory income tax   16,965,000 17,105,000 38,419,000
Increase (reduction) in taxes due to:        
State income taxes net of federal tax benefit   5,639,000 5,685,000 6,017,000
Effect of regulatory treatment of fixed asset differences   (3,696,000) (5,954,000) (4,584,000)
Investment tax credits   (74,000) (74,000) (74,000)
AFUDC equity   (1,870,000) (1,106,000) (1,528,000)
Share base stock compensation   302,000 (278,000) (581,000)
Other   405,000 494,000 (842,000)
Total income tax   17,671,000 $ 15,872,000 $ 36,827,000
State        
Income taxes        
Net operating loss resulting from repairs and maintenance deductions   95,200,000    
State tax credits   4,200,000    
Estimated carried-forward portion of tax credits   2,200,000    
Federal        
Income taxes        
Net operating loss resulting from repairs and maintenance deductions   $ 57,300,000