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Segment Information Information By Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 550,776 | $ 486,747 | $ 503,082 | $ 477,592 | $ 495,713 | $ 506,859 | $ 513,024 | $ 497,590 | $ 2,018,197 | $ 2,013,186 | $ 1,883,533
Gross Profit | $ 174,751 | $ 165,318 | $ 177,860 | $ 157,225 | $ 156,663 | $ 170,749 | $ 169,705 | $ 163,203 | 675,154 | 660,320 | 556,685
Operating Income (Loss) |  |  |  |  |  |  |  |  | 151,426 | 96,211 | 52,846
Income before income taxes |  |  |  |  |  |  |  |  | 134,575 | 84,627 | 37,102
Depreciation and amortization |  |  |  |  |  |  |  |  | 63,215 | 68,318 | 75,993
Total other income (expense) |  |  |  |  |  |  |  |  | (16,851) | (11,584) | (15,744)
Electricity Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,022,939 | 938,374 | 820,306
Gross Profit |  |  |  |  |  |  |  |  | 318,953 | 282,677 | 225,446
Operating Income (Loss) |  |  |  |  |  |  |  |  | 93,566 | 68,287 | 31,104
Depreciation and amortization |  |  |  |  |  |  |  |  | 24,703 | 28,468 | 35,896
Gas Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 533,624 | 569,476 | 543,805
Gross Profit |  |  |  |  |  |  |  |  | 191,303 | 205,063 | 185,559
Operating Income (Loss) |  |  |  |  |  |  |  |  | 74,206 | 66,813 | 67,471
Depreciation and amortization |  |  |  |  |  |  |  |  | 18,800 | 20,714 | 20,288
Water Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 461,634 | 505,336 | 519,422
Gross Profit |  |  |  |  |  |  |  |  | 164,898 | 172,580 | 145,680
Operating Income (Loss) |  |  |  |  |  |  |  |  | 44,494 | 37,266 | 19,864
Depreciation and amortization |  |  |  |  |  |  |  |  | 16,092 | 18,675 | 19,459
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | (60,840) | (76,155) | (65,593)
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 3,620 | $ 461 | $ 350

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