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Goodwill (Text Block) | 9 Months Ended
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Sep. 30, 2017
Goodwill Excluding Non Goodwill Intangibles [Abstract] |
Goodwill Disclosure [Text Block] | Goodwill 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 | 59,137 |  |  | — |  |  | — |  |  | 59,137 |
Effect of change in exchange rates | 2,900 |  |  | 29,390 |  |  | 6,811 |  |  | 39,101 |
Balances at September 30, 2017 |  |  |  |  |  |  |
Goodwill before impairment | 495,848 |  |  | 349,303 |  |  | 374,151 |  |  | 1,219,302 |
Accumulated impairment losses | (382,438 | ) |  | — |  |  | (286,132 | ) |  | (668,570 | )
Goodwill, net | $ | 113,410 |  |  | $ | 349,303 |  |  | $ | 88,019 |  |  | $ | 550,732 |

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- Definition Goodwill, excluding non-goodwill intangible assets [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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