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Information By Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 486,747 | $ 506,859 | $ 1,467,421 | $ 1,517,473
Gross profit | 165,318 | 170,749 | 500,403 | 503,657
Operating Income (Loss) | 37,364 | 6,410 | 104,228 | 65,457
Total other income (expense) | (3,870) | (1,882) | (14,106) | (8,824)
Income Before Income Taxes | 33,494 | 4,528 | 90,122 | 56,633
Electricity Operating Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 240,142 | 242,667 | 729,225 | 692,785
Gross profit | 76,440 | 75,362 | 222,227 | 210,840
Operating Income (Loss) | 17,114 | 20,452 | 51,629 | 51,092
Gas Operating Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 131,780 | 144,185 | 394,691 | 433,707
Gross profit | 46,260 | 56,096 | 147,036 | 158,156
Operating Income (Loss) | 20,030 | 7,136 | 57,849 | 48,811
Water Operating Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 114,825 | 120,007 | 343,505 | 390,981
Gross profit | 42,618 | 39,291 | 131,140 | 134,661
Operating Income (Loss) | 14,837 | (3,546) | 40,258 | 28,707
Corporate Unallocated [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | $ (14,617) | $ (17,632) | $ (45,508) | $ (63,153)

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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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