Segment Information Major Customers (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue, Major Customer [Line Items]
Segment Reporting, Disclosure of Major Customers	For the three and six months ended June 30, 2015 and June 30, 2014, no single customer represented more than 10% of total Company or the Electricity, Gas, or Water operating segment revenues.	For the three and six months ended June 30, 2015 and June 30, 2014, no single customer represented more than 10% of total Company or the Electricity, Gas, or Water operating segment revenues.	For the three and six months ended June 30, 2015 and June 30, 2014, no single customer represented more than 10% of total Company or the Electricity, Gas, or Water operating segment revenues.	For the three and six months ended June 30, 2015 and June 30, 2014, no single customer represented more than 10% of total Company or the Electricity, Gas, or Water operating segment revenues.
Revenue [Member] | Threshold for Reporting Customer Concentration [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage			10.00%	10.00%