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Depreciation and Amortization, by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | $ 30,907 | $ 15,090 | $ 61,979 | $ 29,468
Electricity Operating Segment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | 6,419 | 5,774 | 12,944 | 11,085
Gas Operating Segment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | 4,254 | 4,503 | 8,456 | 8,747
Water Operating Segment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | 4,008 | 3,887 | 8,117 | 7,846
Networks Operating Segment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | 15,223 | 0 | 30,235 | 0
Corporate Unallocated [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | $ 1,003 | $ 926 | $ 2,227 | $ 1,790

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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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