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Information By Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Sales Revenue, Goods, Net | $ 537,110 | $ 432,365
Sales Revenue, Services, Net | 70,111 | 45,227
Revenues | 607,221 | 477,592
Gross profit | 179,855 | 157,637
Operating Income (Loss) | (140,448) | 30,827
Total other income (expense) | (16,010) | (5,766)
Income Before Income Taxes | (156,458) | 25,061
Electricity Operating Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Sales Revenue, Goods, Net | 213,877 | 205,903
Sales Revenue, Services, Net | 38,528 | 32,848
Revenues | 252,405 | 238,751
Gross profit | 69,975 | 67,250
Operating Income (Loss) | (2,768) | 17,084
Gas Operating Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Sales Revenue, Goods, Net | 130,243 | 117,127
Sales Revenue, Services, Net | 7,496 | 7,084
Revenues | 137,739 | 124,211
Gross profit | 43,471 | 50,815
Operating Income (Loss) | (28,348) | 21,731
Water Operating Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Sales Revenue, Goods, Net | 125,587 | 109,335
Sales Revenue, Services, Net | 5,607 | 5,295
Revenues | 131,194 | 114,630
Gross profit | 37,805 | 39,572
Operating Income (Loss) | (11,710) | 8,804
Networks Operating Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Sales Revenue, Goods, Net | 67,403 | 0
Sales Revenue, Services, Net | 18,480 | 0
Revenues | 85,883 | 0
Gross profit | 28,604 | 0
Operating Income (Loss) | (75,510) | 0
Corporate Unallocated [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating Income (Loss) | $ (22,112) | $ (16,792)

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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