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CONDENSED CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Common Stock, No Par Value    
Shares Authorized - 40,000
Shares Outstanding - 2024 - 17,855; 2023 - 17,821 247,576 246,764
Retained Earnings 194,359 176,227
TOTAL COMMON EQUITY 441,935 422,991
Cumulative Preferred Stock, No Par Value:    
Shares Authorized - 120
Shares Outstanding - 2024-19; 2023-21
Convertible:    
TOTAL PREFERRED STOCK 1,889 2,084
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 358,889 364,736
Add: Premium on Issuance of Long-term Debt 6,386 6,529
Less: Unamortized Debt Expense (5,248) (5,372)
Less: Current Portion of Long-term Debt (7,745) (7,740)
TOTAL LONG-TERM DEBT 352,282 358,153
First Mortgage Bonds    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 274,602 278,374
Amortizing Secured Notes    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 67,616 69,724
State Revolving Trust Notes    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 16,671 16,638
Convertible Preferred Stock $7.00 Series    
Convertible:    
TOTAL PREFERRED STOCK 810 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