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CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Common Stock, No Par Value    
Shares Authorized
Shares Outstanding - 2023 - 17,729; 2022 - 17,642 239,545 233,054
Retained Earnings 171,932 167,274
TOTAL COMMON EQUITY 411,477 400,328
Cumulative Preferred Stock, No Par Value:    
Shares Authorized
Shares Outstanding
Convertible:    
TOTAL PREFERRED STOCK 2,084 2,084
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 366,712 306,387
Add: Premium on Issuance of Long-term Debt 6,675 6,873
Less: Unamortized Debt Expense (5,481) (5,518)
Less: Current Portion of Long-term Debt (17,460) (17,462)
TOTAL LONG-TERM DEBT 350,446 290,280
First Mortgage Bonds    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 291,496 252,269
Amortizing Secured Notes    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 63,571 44,918
State Revolving Trust Notes    
Long-term Debt:    
SUBTOTAL LONG-TERM DEBT 11,645 9,200
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