MGE Energy Inc Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Comprehensive Income [Abstract]
Net Income	$ 17,028	$ 18,278
Other comprehensive income, net of tax:
Unrealized loss on available-for-sale securities, net of tax	(164)	(85)
Comprehensive Income	$ 16,864	$ 18,193