CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Electric	$ 274,785	$ 266,629	$ 774,890	$ 756,374
Gas	35,148	34,369	186,214	170,283
Total Revenues	309,933	300,998	961,104	926,657
Operating Expenses
Cost of sales	97,507	96,156	301,324	293,283
Operating, general and administrative	70,244	68,290	226,394	220,730
Property and other taxes	39,111	40,673	118,520	111,302
Depreciation and depletion	41,525	39,763	124,481	119,551
Total Operating Expenses	248,387	244,882	770,719	744,866
Operating Income	61,546	56,116	190,385	181,791
Interest Expense, net	(23,149)	(21,049)	(69,957)	(71,979)
Other Income (Loss)	790	(121)	4,413	4,176
Income Before Income Taxes	39,187	34,946	124,841	113,988
Income Tax (Expense) Benefit	(2,775)	9,659	(10,032)	6,053
Net Income	$ 36,412	$ 44,605	$ 114,809	$ 120,041
Average Common Shares Outstanding	48,486,899	48,314,783	48,441,463	48,288,678
Basic Earnings per Average Common Share	$ 0.75	$ 0.92	$ 2.37	$ 2.49
Diluted Earnings per Average Common Share	0.75	0.92	2.37	2.48
Dividends Declared per Common Share	$ 0.525	$ 0.50	$ 1.575	$ 1.50