Segment Reporting, Disclosure of Major Customers

For the years ended December 31, 2016, 2015, and 2014, no single customer represented more than 10% of total Company or the Gas or Water operating segment revenues. Two customers represented 12% and 10% of total Electricity revenue, respectively, for the year ended December 31, 2016. No customer represented more than 10% of Electricity revenue for the years ended December 31, 2015 and 2014.

Revenue, Major Customer [Line Items]

Percentage of total company revenue represented by one customer

12.00%

Revenue, Major Customer [Line Items]

Segment Information Major Customers (Details)	12 Months Ended
Segment Information Major Customers (Details)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue, Major Customer [Line Items]
Segment Reporting, Disclosure of Major Customers	For the years ended December 31, 2016, 2015, and 2014, no single customer represented more than 10% of total Company or the Gas or Water operating segment revenues. Two customers represented 12% and 10% of total Electricity revenue, respectively, for the year ended December 31, 2016. No customer represented more than 10% of Electricity revenue for the years ended December 31, 2015 and 2014.
Sales [Member] \| Threshold for Reporting Customer Concentration [Member]
Revenue, Major Customer [Line Items]
Percentage of total company revenue represented by one customer	10.00%	10.00%	10.00%
Sales [Member] \| Customer A [Member] \| Electricity Operating Segment [Member]
Revenue, Major Customer [Line Items]
Percentage of total company revenue represented by one customer	12.00%
Sales [Member] \| Customer B [Member] \| Electricity Operating Segment [Member]
Revenue, Major Customer [Line Items]
Percentage of total company revenue represented by one customer	10.00%