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Fixed-asset Impairment (Narrative) (Details) (USD $)	3 Months Ended
Fixed-asset Impairment (Narrative) (Details) (USD $)	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014
Carrying Value		$ 2,510,600,000us-gaap_PropertyPlantAndEquipmentNet	$ 2,517,600,000us-gaap_PropertyPlantAndEquipmentNet
Fixed asset impairment	11,500,000
Parent Company [Member]
Fixed asset impairment	11,500,000
East Bend Station [Member]
Fair Value	2,700,000
Carrying Value	14,200,000
Fixed asset impairment	$ 11,500,000
Production Plan Capacity	186

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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