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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Revenues Gross Profit And Operating Income By Segment [Table Text Block] | Revenues, gross profit, and operating income associated with our segments were as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Revenues |  |  |  |  |
Electricity | $ | 1,022,939 |  |  | $ | 938,374 |  |  | $ | 820,306 |
Gas | 533,624 |  |  | 569,476 |  |  | 543,805 |
Water | 461,634 |  |  | 505,336 |  |  | 519,422 |
Total Company | $ | 2,018,197 |  |  | $ | 2,013,186 |  |  | $ | 1,883,533 |
Gross profit |  |  |  |  |
Electricity | $ | 318,953 |  |  | $ | 282,677 |  |  | $ | 225,446 |
Gas | 191,303 |  |  | 205,063 |  |  | 185,559 |
Water | 164,898 |  |  | 172,580 |  |  | 145,680 |
Total Company | $ | 675,154 |  |  | $ | 660,320 |  |  | $ | 556,685 |
Operating income |  |  |  |  |
Electricity | $ | 93,566 |  |  | $ | 68,287 |  |  | $ | 31,104 |
Gas | 74,206 |  |  | 66,813 |  |  | 67,471 |
Water | 44,494 |  |  | 37,266 |  |  | 19,864 |
Corporate unallocated | (60,840 | ) |  | (76,155 | ) |  | (65,593 | )
Total Company | 151,426 |  |  | 96,211 |  |  | 52,846 |
Total other income (expense) | (16,851 | ) |  | (11,584 | ) |  | (15,744 | )
Income before income taxes | $ | 134,575 |  |  | $ | 84,627 |  |  | $ | 37,102 |
Revenues By Region [Table Text Block] | Revenues by region were as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
United States and Canada | $ | 1,137,508 |  |  | $ | 1,126,787 |  |  | $ | 997,293 |
Europe, Middle East, and Africa (EMEA) | 672,942 |  |  | 698,106 |  |  | 701,301 |
Other | 207,747 |  |  | 188,293 |  |  | 184,939 |
Total Company | $ | 2,018,197 |  |  | $ | 2,013,186 |  |  | $ | 1,883,533 |
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] | Property, plant, and equipment, net, by geographic area were as follows:
| At December 31,
| 2017 |  | 2016
| (in thousands)
United States | $ | 67,764 |  |  | $ | 70,435 |
Outside United States | 133,004 |  |  | 106,023 |
Total Company | $ | 200,768 |  |  | $ | 176,458 |
Depreciation And Amortization Expense Associated With Segments [Table Text Block] | Depreciation and amortization expense associated with our segments was as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Electricity | $ | 24,703 |  |  | $ | 28,468 |  |  | $ | 35,896 |
Gas | 18,800 |  |  | 20,714 |  |  | 20,288 |
Water | 16,092 |  |  | 18,675 |  |  | 19,459 |
Corporate unallocated | 3,620 |  |  | 461 |  |  | 350 |
Total Company | $ | 63,215 |  |  | $ | 68,318 |  |  | $ | 75,993 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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