Fixed-asset Impairment (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Carrying Value	$ 2,514,400,000	$ 2,534,200,000
Fixed asset impairment	11,500,000
Parent Company [Member]
Fixed asset impairment	11,500,000
East Bend Station [Member]
Fair Value	2,700,000
Fixed asset impairment	$ 11,500,000
Production Plan Capacity	186