Taxes (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Line Items]
Effective income tax rate	38.00%	37.60%	37.80%	37.80%
MGE [Member]
Income Tax Disclosure [Line Items]
Effective income tax rate	37.90%	37.60%	37.80%	37.80%