Goodwill Goodwill Narrative (Details) (USD $)	12 Months Ended					12 Months Ended			1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Electricity Operating Segment [Member]	Dec. 31, 2011 North America [Member]	Dec. 31, 2012 Europe [Member]	Dec. 31, 2011 Scenario, Previously Reported [Member] North America [Member]	Dec. 31, 2012 Scenario, Adjustment [Member] North America [Member]	May 31, 2013 Expected Loss Recognized Resulting from Inclusion of Certain Integration Costs not Originally Reflected in Acquisition Valuation Model [Member]	May 01, 2012 Customer Relationship Associated with Error Adjustment - Balance Prior to Correction of Error [Member]
Goodwill [Line Items]
Goodwill impairment	$ (173,249,000)	$ 0	$ (584,847,000)	$ (173,249,000)
Loss on Contracts									2,400,000
Finite-Lived Intangible Assets, Gross	804,281,000	783,140,000								1,500,000
Goodwill, Written off Related to Sale of Business Unit						675,000	6,700,000	(5,400,000)
Disposal Group, Including Discontinued Operation, Goodwill					$ 1,300,000