Segment Information Major Customers (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Sales [Member] Threshold for Reporting Customer Concentration [Member]	Dec. 31, 2011 Sales [Member] Customer A [Member] Electricity Operating Segment [Member]	Dec. 31, 2011 Sales [Member] Customer B [Member] Electricity Operating Segment [Member]	Dec. 31, 2012 Sales [Member] Customer C [Member] Electricity Operating Segment [Member]
Revenue, Major Customer [Line Items]
Segment Reporting, Disclosure of Major Customers	For the year ended December 31, 2013, no single customer represented more than 10% of total Company or the Electricity, Gas or Water operating segment revenues. For the year ended December 31, 2012, no single customer represented more than 10% of total Company or the Gas or Water operating segment revenues, and one customer accounted for 17% of the Electricity operating segment revenues. For the year ended December 31, 2011, no single customer represented more than 10% of total Company or the Gas or Water operating segment revenues, and one customer from the Electricity operating segment accounted 15% and a second customer accounted for 14% of the Electricity operating segment revenues.
Percentage of total company revenue represented by one customer		10.00%	15.00%	14.00%	17.00%