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Depreciation and Amortization, by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | $ 16,532 | $ 16,082 | $ 46,000 | $ 51,563
Electricity Operating Segment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | 6,687 | 6,682 | 17,772 | 21,715
Gas Operating Segment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | 5,084 | 5,595 | 13,831 | 15,484
Water Operating Segment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | 3,860 | 5,022 | 11,706 | 14,040
Corporate Unallocated [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | $ 901 | $ (1,217) | $ 2,691 | $ 324

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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