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CONDENSED CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Common Stock, No Par Value $ 248,611 $ 248,202
Retained Earnings 200,437 197,061
TOTAL COMMON EQUITY 449,048 445,263
Convertible:    
TOTAL PREFERRED STOCK 1,614 1,635
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 357,827 359,386
Add: Premium on Issuance of Long-term Debt 6,290 6,339
Less: Unamortized Debt Expense (5,139) (5,192)
Less: Current Portion of Long-term Debt (7,720) (7,711)
TOTAL LONG-TERM DEBT 351,258 352,822
First Mortgage Bonds    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 273,856 274,602
Amortizing Secured Notes    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 66,160 66,889
State Revolving Trust Notes    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 17,811 17,895
Convertible Preferred Stock $7.00 Series    
Convertible:    
TOTAL PREFERRED STOCK 535 556
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