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CONDENSED CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Common Stock, No Par Value    
Shares Authorized - 40,000
Shares Outstanding - 2024 - 17,829; 2023 - 17,821 247,014 246,764
Retained Earnings 185,864 176,227
TOTAL COMMON EQUITY 432,878 422,991
Cumulative Preferred Stock, No Par Value:    
Shares Authorized - 120
Shares Outstanding - 20
Convertible:    
TOTAL PREFERRED STOCK 2,084 2,084
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 362,804 364,736
Add: Premium on Issuance of Long-term Debt 6,432 6,529
Less: Unamortized Debt Expense (5,293) (5,372)
Less: Current Portion of Long-term Debt (7,968) (7,740)
TOTAL LONG-TERM DEBT 355,975 358,153
First Mortgage Bonds    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 277,619 278,374
Amortizing Secured Notes    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 68,342 69,724
State Revolving Trust Notes    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 16,843 16,638
Convertible Preferred Stock $7.00 Series    
Convertible:    
TOTAL PREFERRED STOCK 1,005 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