CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues
Electric	$ 1,052,182	$ 940,815	$ 981,178
Gas	320,134	257,855	276,732
Total Revenues	1,372,316	1,198,670	1,257,910
Utilities Operating Expense, Fuel Used	425,548	306,190	318,020
Operating Expenses
Operating and maintenance	208,303	202,991	209,052
Administrative and general	101,873	94,124	109,177
Property and other taxes	173,444	179,517	171,888
Depreciation and depletion	187,467	179,644	172,923
Total Operating Expenses	1,096,635	962,466	981,060
Operating Income	275,681	236,204	276,850
Interest Expense, net	(93,674)	(96,812)	(95,068)
Other Income, net	8,252	4,853	413
Income Before Income Taxes	190,259	144,245	182,195
Income Tax (Expense) Benefit	(3,419)	10,970	19,925
Net Income	$ 186,840	$ 155,215	$ 202,120
Average Common Shares Outstanding	51,709,229	50,559,208	50,428,560
Basic Earnings per Average Common Share	$ 3.61	$ 3.07	$ 4.01
Diluted Earnings per Average Common Share	$ 3.60	$ 3.06	$ 3.98