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Depreciation and Amortization, by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | $ 30,449 | $ 16,532 | $ 92,428 | $ 46,000
Electricity Operating Segment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | 6,008 | 6,687 | 18,952 | 17,772
Gas Operating Segment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | 4,363 | 5,084 | 12,819 | 13,831
Water Operating Segment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | 3,824 | 3,860 | 11,941 | 11,706
Networks Operating Segment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | 15,214 | 0 | 45,449 | 0
Corporate Unallocated [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization | $ 1,040 | $ 901 | $ 3,267 | $ 2,691

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&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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