CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Common Stock, No Par Value
Shares Authorized
Shares Outstanding	233,054	221,919
Retained Earnings	167,274	145,807
TOTAL COMMON EQUITY	400,328	367,726
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	306,387	311,146
Add: Premium on Issuance of Long-term Debt	6,873	7,271
Less: Unamortized Debt Expense	(5,518)	(5,166)
Less: Current Portion of Long-term Debt	(17,462)	(6,731)
TOTAL LONG-TERM DEBT	290,280	306,520
First Mortgage Bonds
Long-term Debt:
SUBTOTAL LONG-TERM DEBT	252,269	203,892
First Mortgage Bonds due 2023-2059
Long-term Debt:
SUBTOTAL LONG-TERM DEBT	44,918	47,613
State Revolving Trust Notes
Long-term Debt:
SUBTOTAL LONG-TERM DEBT	9,200	7,510
Construction Loans
Long-term Debt:
SUBTOTAL LONG-TERM DEBT		52,131
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