Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Income	$ 86,874	$ 84,219	$ 97,606
Other comprehensive income, net of tax:
Unrealized gain (loss) on available for sale securities, net of tax	0	0	175
Comprehensive Income	86,874	84,219	97,781
MGE [Member]
Net Income	80,779	79,036	93,072
Other comprehensive income, net of tax:
Unrealized gain (loss) on available for sale securities, net of tax	0	0	(47)
Comprehensive Income Including Noncontrolling Interest	80,779	79,036	93,025
Less: Comprehensive Income Attributable to Noncontrolling Interest, net of tax	(22,349)	(22,552)	(43,237)
Comprehensive Income	$ 58,430	$ 56,484	$ 49,788