CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues
Electric	$ 248,403	$ 221,362	$ 489,745	$ 457,408
Gas	44,717	49,198	135,914	159,163
Total Revenues	293,120	270,560	625,659	616,571
Operating Expenses
Cost of sales	81,693	79,527	197,127	191,918
Operating, general and administrative	72,579	61,720	152,440	142,843
Property and other taxes	35,208	32,454	70,629	65,241
Depreciation and depletion	39,898	35,727	79,788	71,546
Total Operating Expenses	229,378	209,428	499,984	471,548
Operating Income	63,742	61,132	125,675	145,023
Interest Expense, net	(26,421)	(22,943)	(50,930)	(46,058)
Other Income	1,195	995	4,297	1,660
Income Before Income Taxes	38,516	39,184	79,042	100,625
Income Tax Expense	(2,947)	(8,211)	(5,419)	(18,227)
Net Income	$ 35,569	$ 30,973	$ 73,623	$ 82,398
Average Common Shares Outstanding	48,308,656	47,043,735	48,275,482	47,010,546
Basic Earnings per Average Common Share	$ 0.74	$ 0.66	$ 1.53	$ 1.75
Diluted Earnings per Average Common Share	0.73	0.65	1.52	1.74
Dividends Declared per Common Share	$ 0.50	$ 0.48	$ 1.00	$ 0.96