CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues
Electric	$ 273,037	$ 238,342
Gas	111,183	103,160
Total Revenues	384,220	341,502
Operating Expenses
Cost of sales	115,735	96,077
Operating, general and administrative	81,092	74,345
Property and other taxes	44,789	42,813
Depreciation and depletion	45,584	43,755
Total Operating Expenses	287,200	256,990
Operating Income	97,020	84,512
Interest Expense, net	(23,790)	(22,970)
Other Income (Expense), net	1,149	(1,129)
Income Before Income Taxes	74,379	60,413
Income Tax Expense	(1,573)	(1,914)
Net Income	$ 72,806	$ 58,499
Average Common Shares Outstanding	50,380,839	49,416,230
Basic Earnings per Average Common Share	$ 1.45	$ 1.18
Diluted Earnings per Average Common Share	1.44	1.18
Dividends Declared per Common Share	$ 0.575	$ 0.550