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Depreciation and Amortization, by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Property, Plant and Equipment [Line Items] |  |
Depreciation and amortization | $ 31,072 | $ 14,378
Electricity Operating Segment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Depreciation and amortization | 6,525 | 5,311
Gas Operating Segment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Depreciation and amortization | 4,202 | 4,244
Water Operating Segment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Depreciation and amortization | 4,109 | 3,959
Networks Operating Segment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Depreciation and amortization | 15,012 | 0
Corporate Unallocated [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Depreciation and amortization | $ 1,224 | $ 864

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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