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Segment Information Major Customers (Details) | 12 Months Ended
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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% |  |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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- Definition Disclosure of the extent of enterprise reliance on its major customers. For example, includes revenues from transactions with a single external customer amounting to 10 percent or more of the entity's revenues, the total amount of revenues from each such customer, and the identity of the segment or segments reporting the revenues. A group of entities that the entity knows to be under common control generally will be considered a single customer for inclusion in this item. The federal government, a state government, a local government (for example, a county or municipality), or a foreign government each will generally be considered as a single customer for inclusion in this item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9054-108599 + Details
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