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CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Common Stock, No Par Value    
Shares Authorized Value
Shares Outstanding Value 248,202 246,764
Retained Earnings 197,061 176,227
TOTAL COMMON STOCKHOLDERS’ EQUITY 445,263 422,991
Cumulative Preferred Stock, No Par Value:    
Shares Authorized Value
Shares Outstanding Value
Convertible:    
TOTAL PREFERRED STOCK 1,635 2,084
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 359,386 364,736
Add: Premium on Issuance of Long-term Debt 6,339 6,529
Less: Unamortized Debt Expense (5,192) (5,372)
Less: Current Portion of Long-term Debt (7,711) (7,740)
TOTAL LONG-TERM DEBT 352,822 358,153
First Mortgage Bonds    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 274,602 278,374
Amortizing Secured Notes    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 66,889 69,724
State Revolving Trust Notes    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 17,895 16,638
Convertible Preferred Stock $7.00 Series    
Convertible:    
TOTAL PREFERRED STOCK 556 1,005
Nonredeemable Preferred Stock $7.00 Series    
Convertible:    
TOTAL PREFERRED STOCK 79 79
Nonredeemable Preferred Stock $4.75 Series    
Convertible:    
TOTAL PREFERRED STOCK $ 1,000 $ 1,000