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Schedule of Goodwill Allocated to Reporting Segments (Tables) | 3 Months Ended
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Mar. 31, 2018
Goodwill Excluding Non Goodwill Intangibles [Abstract] |
Schedule of Goodwill [Table Text Block] | The following table reflects goodwill allocated to each reporting unit:
| Electricity |  | Gas |  | Water |  | Networks |  | Total Company
| (in thousands)
Goodwill balance at January 1, 2018 |  |  |  |  |  |  |  |  |
Goodwill before impairment | $ | 500,625 |  |  | $ | 352,703 |  |  | $ | 378,901 |  |  | $ | — |  |  | $ | 1,232,229 |
Accumulated impairment losses | (386,384 | ) |  | — |  |  | (290,083 | ) |  | — |  |  | (676,467 | )
Goodwill, net | 114,241 |  |  | 352,703 |  |  | 88,818 |  |  | — |  |  | 555,762 |
Goodwill acquired | — |  |  | — |  |  | — |  |  | 572,499 |  |  | 572,499 |
Effect of change in exchange rates | 1,031 |  |  | 10,788 |  |  | 2,560 |  |  | 117 |  |  | 14,496 |
Goodwill balance at March 31, 2018 |  |  |  |  |  |  |  |  |
Goodwill before impairment | 514,057 |  |  | 363,491 |  |  | 393,693 |  |  | 572,616 |  |  | 1,843,857 |
Accumulated impairment losses | (398,785 | ) |  | — |  |  | (302,315 | ) |  | — |  |  | (701,100 | )
Goodwill, net | $ | 115,272 |  |  | $ | 363,491 |  |  | $ | 91,378 |  |  | $ | 572,616 |  |  | $ | 1,142,757 |

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- Definition Goodwill, excluding non-goodwill intangible assets [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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