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Segment Information Information By Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 495,713 | $ 506,859 | $ 513,024 | $ 497,590 | $ 496,448 | $ 469,528 | $ 470,811 | $ 446,746 | $ 2,013,186 | $ 1,883,533 | $ 1,947,616
Gross Profit | $ 156,663 | $ 170,749 | $ 169,705 | $ 163,203 | $ 152,419 | $ 147,290 | $ 118,554 | $ 138,422 | 660,320 | 556,685 | 614,050
Operating Income (Loss) |  |  |  |  |  |  |  |  | 96,211 | 52,846 | 480
Total other income (expense) |  |  |  |  |  |  |  |  | (11,584) | (15,744) | (18,745)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 84,627 | 37,102 | (18,265)
Depreciation and amortization |  |  |  |  |  |  |  |  | 68,318 | 75,993 | 98,139
Electricity Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 938,374 | 820,306 | 771,857
Gross Profit |  |  |  |  |  |  |  |  | 282,677 | 225,446 | 200,249
Operating Income (Loss) |  |  |  |  |  |  |  |  | 68,287 | 31,104 | (77,751)
Depreciation and amortization |  |  |  |  |  |  |  |  | 28,468 | 35,896 | 47,889
Gas Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 569,476 | 543,805 | 599,091
Gross Profit |  |  |  |  |  |  |  |  | 205,063 | 185,559 | 211,623
Operating Income (Loss) |  |  |  |  |  |  |  |  | 66,813 | 67,471 | 76,101
Depreciation and amortization |  |  |  |  |  |  |  |  | 20,714 | 20,288 | 25,706
Water Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 505,336 | 519,422 | 576,668
Gross Profit |  |  |  |  |  |  |  |  | 172,580 | 145,680 | 202,178
Operating Income (Loss) |  |  |  |  |  |  |  |  | 37,266 | 19,864 | 71,356
Depreciation and amortization |  |  |  |  |  |  |  |  | 18,675 | 19,459 | 24,257
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | (76,155) | (65,593) | (69,226)
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 461 | $ 350 | $ 287

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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=66902209&loc=d3e3602-108585 + Details
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