CONDENSED CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Common Stock, No Par Value
Shares Authorized
Shares Outstanding	282,243	279,148
Retained Earnings	218,803	214,883
TOTAL COMMON EQUITY	501,046	494,031
Cumulative Preferred Stock, No Par Value:
Shares Authorized
Shares Outstanding
TOTAL PREFERRED STOCK	1,343	1,343
Long-term Debt:
SUBTOTAL LONG-TERM DEBT	378,275	385,683
Add: Premium on Issuance of Long-term Debt	6,099	6,148
Less: Unamortized Debt Expense	(5,032)	(5,107)
Less: Current Portion of Long-term Debt	(7,666)	(7,850)
TOTAL LONG-TERM DEBT	371,676	378,874
First Mortgage Bonds
Long-term Debt:
SUBTOTAL LONG-TERM DEBT	300,431	301,172
Amortizing Secured Notes
Long-term Debt:
SUBTOTAL LONG-TERM DEBT	56,159	63,971
State Revolving Trust Notes
Long-term Debt:
SUBTOTAL LONG-TERM DEBT	21,685	20,540
Convertible Preferred Stock $7.00 Series
Cumulative Preferred Stock, No Par Value:
TOTAL PREFERRED STOCK	264	264
Nonredeemable Preferred Stock $7.00 Series
Cumulative Preferred Stock, No Par Value:
TOTAL PREFERRED STOCK	79	79
Nonredeemable Preferred Stock $4.75 Series
Cumulative Preferred Stock, No Par Value:
TOTAL PREFERRED STOCK	$ 1,000	$ 1,000