CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues
Electric	$ 266,239	$ 241,342
Gas	101,073	91,197
Total Revenues	367,312	332,539
Operating Expenses
Cost of sales	119,817	115,434
Operating, general and administrative	80,962	79,861
Property and other taxes	39,928	35,421
Depreciation and depletion	41,461	39,890
Total Operating Expenses	282,168	270,606
Operating Income	85,144	61,933
Interest Expense, net	(23,400)	(24,509)
Other Income	1,500	3,102
Income Before Income Taxes	63,244	40,526
Income Tax Expense	(6,677)	(659)
Net Income	$ 56,567	$ 39,867
Average Common Shares Outstanding	48,385,738	48,242,307
Basic Earnings per Average Common Share	$ 1.17	$ 0.83
Diluted Earnings per Average Common Share	1.17	0.82
Dividends Declared per Common Share	$ 0.525	$ 0.50