CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues
Electric	$ 217,938	$ 219,659	$ 462,563	$ 492,696
Gas	51,422	51,060	142,052	162,243
Total Revenues	269,360	270,719	604,615	654,939
Operating Expenses
Cost of revenue	61,043	55,744	152,315	171,479
Operating, general and administrative	71,715	80,826	150,720	161,918
Property and other taxes	46,981	44,310	91,480	89,099
Depreciation and depletion	44,782	41,016	90,047	86,600
Total Operating Expenses	224,521	221,896	484,562	509,096
Operating Income	44,839	48,823	120,053	145,843
Interest Expense, net	(24,287)	(23,511)	(48,621)	(47,301)
Other Income (Expense), net	224	124	(1,758)	1,273
Income Before Income Taxes	20,776	25,436	69,674	99,815
Income Tax Benefit	718	22,226	2,524	20,653
Net Income	$ 21,494	$ 47,662	$ 72,198	$ 120,468
Average Common Shares Outstanding	50,569,725	50,440,685	50,538,260	50,410,928
Basic Earnings per Average Common Share	$ 0.43	$ 0.94	$ 1.43	$ 2.39
Diluted Earnings per Average Common Share	0.43	0.94	1.43	2.38
Dividends Declared per Common Share	$ 0.600	$ 0.575	$ 1.20	$ 1.15