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Schedule of Goodwill Allocated to Reporting Segments (Tables) | 6 Months Ended
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Jun. 30, 2017
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 |  | Total Company
| (in thousands)
Balances at January 1, 2017 |  |  |  |  |  |  |
Goodwill before impairment | $ | 400,299 |  |  | $ | 319,913 |  |  | $ | 334,505 |  |  | $ | 1,054,717 |
Accumulated impairment losses | (348,926 | ) |  | — |  |  | (253,297 | ) |  | (602,223 | )
Goodwill, net | 51,373 |  |  | 319,913 |  |  | 81,208 |  |  | 452,494 |
Goodwill acquired | 60,286 |  |  | — |  |  | — |  |  | 60,286 |
Effect of change in exchange rates | 2,065 |  |  | 21,158 |  |  | 5,068 |  |  | 28,291 |
Balances at June 30, 2017 |  |  |  |  |  |  |
Goodwill before impairment | 486,834 |  |  | 341,071 |  |  | 363,185 |  |  | 1,191,090 |
Accumulated impairment losses | (373,110 | ) |  | — |  |  | (276,909 | ) |  | (650,019 | )
Goodwill, net | $ | 113,724 |  |  | $ | 341,071 |  |  | $ | 86,276 |  |  | $ | 541,071 |

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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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